High-Performance Batteries: Energy Density vs. Power Density

Learn how energy density and power density affect high performance batteries, runtime, output, size, thermal demands, and custom battery pack design.

High-Performance Batteries Explained: Energy Density vs. Power Density

When engineers evaluate high performance batteries, capacity is only one part of the equation.

Two batteries can have similar physical dimensions or stored energy but perform very differently once they are integrated into an application. One may be optimized to operate for a long time between charges, while another may be designed to deliver a large amount of power within seconds.

This difference often comes down to two important battery performance metrics: energy density and power density.

Understanding the difference between them can help OEMs make better decisions about cell chemistry, battery size, discharge requirements, thermal management, and overall battery pack design.

What Is a High-Performance Battery?

A high performance battery is not simply a battery with the highest capacity or highest energy density.

Performance depends on what the application actually requires.

For one device, high performance may mean maximizing operating time while minimizing battery weight. For another, it may mean supplying a high current during startup or supporting repeated power pulses. Other applications may prioritize cycle life, temperature performance, reliability, packaging flexibility, or a combination of these requirements.

That is why battery selection should begin with the application rather than a single specification.

Through our custom battery design services, we evaluate electrical, mechanical, safety, and application requirements before developing a battery pack around the needs of the product.

What Is Battery Energy Density?

Energy density describes how much energy a battery can store relative to its mass or volume.

It is commonly expressed in two ways:

Gravimetric energy density or specific energy: watt-hours per kilogram (Wh/kg)
Volumetric energy density: watt-hours per liter (Wh/L)

Natural Resources Canada defines energy density as the amount of energy stored relative to battery mass or volume. It also notes that energy density generally decreases as the measurement moves from active materials to cells, modules, and complete packs because components such as enclosures and thermal-management systems add weight and volume without adding stored energy.

For product engineers, this distinction matters.

A cell-level energy-density figure should not automatically be treated as the energy density of the finished battery pack.

Why Does High Energy Density Matter?

Higher energy density can help an OEM achieve objectives such as:

Longer runtime without substantially increasing battery weight
More stored energy within a limited physical space
Smaller or lighter portable products
Greater design flexibility where battery volume is constrained

The U.S. Department of Energy explains that increasing volumetric energy density can allow an electric vehicle, for example, to travel farther without increasing battery-pack size or potentially achieve the same range with a smaller pack.

The same basic design principle applies beyond vehicles. Medical equipment, instrumentation, communications systems, tracking devices, portable electronics, and other battery-powered products can all face limitations on available weight or space.

We develop custom lithium-ion battery packs for applications where size, weight, voltage, current requirements, safety, and reliability need to be considered together.

What Is Battery Power Density?

If energy density describes how much energy is available, power density describes how rapidly that energy can be delivered.

Power density may be expressed as:

Watts per kilogram (W/kg)
Watts per liter (W/L)

Natural Resources Canada describes power density as a battery’s rate capability, or the flow of energy into or out of the battery during charging and discharging relative to mass or volume.

Power requirements also need context. Factors such as discharge rate, temperature, state of charge, pulse duration, and whether the specification refers to continuous or pulse power can affect battery performance.

Why Does High Power Density Matter?

Some applications have relatively stable electrical loads. Others may suddenly require much more current.

High power capability becomes particularly important when equipment must support:

High-current startup
Motors or actuators
Short power bursts
Rapid acceleration
High-load communications
Pulsed equipment
Other demanding electrical loads

In these cases, simply choosing a battery with high capacity does not guarantee that it can safely provide the required current.

Energy Density vs. Power Density: What Is the Difference?

A simple way to understand the distinction is:

Energy density tells you how much energy the battery can carry. Power density tells you how quickly the battery can deliver it.

Metric	Energy Density	Power Density
Main question	How much energy can the battery store?	How quickly can the battery deliver energy?
Common units	Wh/kg or Wh/L	W/kg or W/L
Major design consideration	Runtime, size and weight	Current output and load demand
Important for	Long-duration operation	High-load or pulse operation
Higher value generally supports	More energy in less mass or volume	Greater power delivery relative to mass or volume

Both measurements are important, but neither should be evaluated independently from the application.

High Energy Battery vs. High Power Battery

Consider two hypothetical products.

Product A is a portable monitoring device expected to operate for long periods between charges. Its current demand is relatively modest.

Its design may prioritize:

high energy density → more stored energy → longer potential runtime

Now consider Product B, which contains a motor that creates a substantial temporary load during startup.

Its battery may need to prioritize:

high power capability → greater current delivery → better support for peak loads

Selecting a high-energy cell without verifying its discharge capability could result in poor performance in Product B. Likewise, optimizing Product A exclusively for high power could sacrifice energy capacity that would have been more valuable for its actual duty cycle.

This is why battery engineering is fundamentally an optimization problem rather than a search for the battery with the largest specification number.

Can a Battery Have Both High Energy and High Power Density?

Battery technology can provide combinations of strong energy and power performance, but engineering trade-offs remain.

Cell chemistry, electrode design, internal resistance, physical construction, thermal conditions, discharge rate, battery management, and other factors can influence how a battery performs.

Within lithium-ion chemistry, different formulations can favor different performance characteristics. Lithium cobalt oxide can provide high energy density, while lithium iron phosphate is often selected where discharge capability, cycle life, and thermal stability are important.

This makes chemistry selection an application-specific engineering decision rather than a universal ranking of one chemistry as “best.”

For a deeper technical discussion of this trade-off, see our guide to energy density vs. power density in battery pack design.

Why Cell-Level Specifications Are Not Enough

A common battery-selection mistake is comparing cells solely through datasheet specifications.

An OEM ultimately uses a battery system, not an isolated cell.

The completed pack may also include:

Battery management system
Protection electronics
Wiring and interconnects
Connectors
Mechanical enclosure
Insulation
Thermal-management components
Fuel-gauge electronics
Charging controls

These components affect the final pack’s mass, volume, electrical performance, safety, and reliability.

That is one reason we evaluate pack-level performance separately from cell-level performance when developing a custom solution.

How Battery Management Affects High Performance Applications

High performance batteries also need appropriate control and protection.

A battery management system may monitor or manage factors such as cell voltage, current, temperature, charging, discharge limits, state of charge, and cell balancing depending on the battery design.

This becomes particularly important as electrical and thermal demands increase.

Our smart battery design capabilities include protection circuits, fuel gauges, charger-control PCBAs, and battery management systems.

The objective is not simply to select a high-performance cell. We look at the entire battery pack as an integrated system.

Temperature Matters Too

Battery performance figures should not be evaluated without considering operating conditions.

Temperature can affect electrochemical reaction rates and battery performance. A battery that meets a power requirement under controlled laboratory conditions may behave differently when used in an application exposed to very low or high temperatures.

OEM requirements should therefore identify the expected operating environment early in the development process.

This can influence cell selection, enclosure design, thermal management, BMS parameters, testing, and potentially the physical size of the finished battery.

How Should OEMs Choose Between Energy and Power?

Instead of beginning with “What battery has the highest energy density?”, engineering teams should define what the finished product needs the battery to do.

Important questions include:

How much energy does the product consume during a typical operating cycle?
What runtime is required?
What is the average electrical load?
What is the maximum continuous load?
Are there short-duration peak loads?
How much space is available for the battery?
What is the maximum acceptable battery weight?
What temperatures will the product encounter?
What charging time is acceptable?
What cycle-life expectations does the product have?
What safety or regulatory requirements apply?
Does the application require a custom BMS, enclosure, connector, or communication system?

Once these requirements are defined, engineers can evaluate energy density and power density in the context of the entire system.

Our broader battery engineering and manufacturing capabilities support multiple battery chemistries and applications, including lithium-ion, lithium-polymer, lithium iron phosphate, lithium primary, and nickel-metal hydride solutions.

Energy Density and Power Density Are Only Part of Battery Performance

A high performance battery should not be evaluated using one metric.

Energy density and power density need to be considered alongside:

Safety
Cycle life
Calendar life
Operating temperature
Charging characteristics
Internal resistance
Mechanical requirements
Battery management
Reliability
Manufacturing consistency
Regulatory requirements
Cost and supply availability

A battery with exceptional energy density but inadequate discharge capability may be wrong for a high-load device.

A battery with exceptional power capability but insufficient energy storage may require an unnecessarily large pack to achieve the required runtime.

The appropriate battery is the one that achieves the right balance for the actual product.

Frequently Asked Questions

What is energy density in a battery?

Battery energy density describes how much energy a battery stores relative to its mass or volume. Gravimetric energy density is typically expressed in Wh/kg, while volumetric energy density is typically expressed in Wh/L.

What is power density in a battery?

Power density describes how rapidly a battery can deliver energy relative to its mass or volume. It is commonly expressed in W/kg or W/L.

Is higher energy density always better?

No. Higher energy density can be valuable when runtime, weight, or available space is important, but battery selection also needs to account for power requirements, temperature, safety, cycle life, charging, physical design, and other application requirements.

What is the difference between energy density and battery capacity?

Battery capacity describes the amount of electrical charge a battery can provide and is commonly stated in ampere-hours (Ah). Energy considers both capacity and voltage and is expressed in watt-hours (Wh). Energy density relates that stored energy to the battery’s mass or volume.

Does higher power density mean longer battery life?

Not necessarily. Power density describes how quickly energy can be delivered, while energy density is more closely associated with how much energy can be stored for a given mass or volume. Runtime depends on the battery’s usable energy and the application’s load profile.

Which battery chemistry is best for high performance applications?

There is no single best chemistry for every high-performance application. The appropriate chemistry depends on required energy, power, cycle life, operating temperature, size, weight, safety requirements, charging characteristics, cost, and other design constraints.

Build the Battery Around the Application

For OEM product development, the question should not be whether energy density or power density is more important in general.

The better question is:

What combination of energy, power, size, weight, safety, runtime, and lifecycle does this specific product require?

Answering that question early can help engineering teams make better decisions about cell chemistry, pack architecture, electronics, thermal requirements, mechanical design, and testing.

At Emerging Power, we work with OEMs to develop custom battery solutions around specific electrical and mechanical requirements, from initial technical review and battery design through prototyping, testing, and manufacturing.

Request a quote to discuss your application’s energy, power, size, operating environment, and performance requirements.

Lithium Polymer Battery Manufacturers: How to Evaluate Quality

Choosing among lithium polymer battery manufacturers involves much more than comparing capacity, dimensions, lead times, and price.

Lithium Polymer Battery Manufacturers: How to Evaluate Quality

Choosing among lithium polymer battery manufacturers involves much more than comparing capacity, dimensions, lead times, and price.

For OEMs, the quality of a lithium polymer battery can directly affect product performance, reliability, safety, certification, and long-term supply continuity. Two battery packs with similar specifications on paper may perform very differently depending on the cells used, protection electronics, engineering decisions, manufacturing controls, testing procedures, and component traceability behind them.

That makes supplier evaluation an important part of product development.

This guide explains what OEMs should examine when evaluating a lithium polymer battery manufacturer and which questions can help distinguish a capable manufacturing partner from a basic battery supplier.

What Is a Lithium Polymer Battery?

A lithium polymer battery, often called a LiPo or Li-Polymer battery, is a rechargeable lithium-based battery commonly selected for applications where weight, energy density, or form-factor flexibility is important.

Lithium polymer cells are available in thin and compact configurations that can be useful when a conventional cylindrical cell does not fit the mechanical requirements of a product.

LiPo batteries can be found in applications such as:

Medical and portable equipment
Communications systems
Tracking devices
Industrial electronics
Instrumentation
Portable OEM products
Specialized commercial equipment
Military and defense applications

However, selecting LiPo chemistry is only the beginning. The cell still needs to be properly selected and integrated into a battery pack that meets the electrical, mechanical, environmental, and safety requirements of the finished product.

OEMs developing a specialized application can learn more about custom battery design and how cell selection, electronics, enclosure design, testing, and compliance fit into the development process.

Why Does Lithium Polymer Battery Manufacturer Quality Matter?

Battery quality is not determined by one specification.

A battery pack is a system. Cell quality matters, but so do the protection circuit, battery management system, wiring, connectors, mechanical construction, thermal considerations, assembly processes, firmware where applicable, and production testing.

Poor control over any of these areas can create problems such as:

Inconsistent runtime
Capacity variation
Unexpected voltage behavior
Premature degradation
Charging problems
Excessive heat
Mechanical fit issues
Higher production defect rates
Certification delays
Field failures

This is why OEM buyers should evaluate the manufacturer’s complete engineering and manufacturing process rather than focusing exclusively on price per pack.

1. Start With Cell Quality and Sourcing

One of the first questions to ask a potential LiPo battery manufacturer is where its cells come from.

The manufacturer should be able to explain its cell sourcing and qualification process. OEMs should understand whether the supplier has established relationships with cell manufacturers and how incoming cells are inspected before they enter production.

Questions worth asking include:

Who manufactures the cells?
How are incoming cells inspected?
How are cell specifications verified?
Are cells traceable to production lots?
How is cell consistency evaluated?
How are storage conditions controlled?
What happens if the selected cell becomes unavailable?

Cell selection should also reflect the actual application. Capacity alone is not enough. Discharge requirements, operating temperature, expected cycle life, charging characteristics, physical dimensions, and other factors may influence which cell is appropriate.

Emerging Power states that it maintains relationships with established cell manufacturers including Panasonic, Samsung, Moli Energy, LG, and Sony and supports multiple battery chemistries, including Li-Polymer.

For a deeper look at the sourcing process, read How to Select the Right Lithium Cell Manufacturer for Your Custom Battery Project.

2. Evaluate the Manufacturer’s Engineering Capabilities

A battery supplier and an engineering-oriented battery manufacturer do not necessarily provide the same level of support.

For a custom OEM project, the manufacturer may need to evaluate:

Required voltage
Capacity and runtime
Continuous and peak current
Charging requirements
Operating temperature
Physical dimensions
Weight restrictions
Connector requirements
Communication requirements
Environmental conditions
Protection requirements
Expected production quantities

The manufacturer should be able to explain why a particular cell, configuration, protection circuit, or BMS design is appropriate for the application.

This is particularly important with lithium polymer batteries because their form-factor flexibility can encourage OEMs to focus heavily on fitting the battery into a restricted space. Electrical performance, thermal behavior, protection, manufacturability, and long-term reliability still need to be considered alongside size.

Emerging Power’s custom battery design services include electrical and mechanical engineering, protection circuits, BMS solutions, charging circuits, automated testing, and regulatory support.

3. Review the Protection Circuit and BMS Design

For many rechargeable lithium battery applications, protection electronics are a critical part of the pack.

Depending on the application and configuration, a battery management or protection system may monitor conditions such as voltage, current, and temperature and provide protection against conditions such as overcharge, over-discharge, excessive current, or short circuits.

More sophisticated systems may also require:

Cell balancing
State-of-charge monitoring
Fuel gauging
Communication with the host device
Custom firmware
Fault monitoring
Data logging

Do not assume that every manufacturer has the same electronics capabilities.

Ask whether the manufacturer designs and integrates battery electronics internally, uses an existing platform, or outsources this portion of development.

You can learn more in Emerging Power’s guide to custom battery pack design.

4. Examine Quality Management Systems

A successful prototype does not prove that a manufacturer can repeatedly build the same battery at production scale.

This is where quality systems become important.

When evaluating lithium polymer battery manufacturers, ask about:

Incoming material inspection
Supplier qualification
Work instructions
In-process inspections
Production testing
First-article inspection
Lot traceability
Nonconforming material procedures
Engineering change control
Corrective actions
Final inspection
Production records

Quality certifications can also provide useful evidence that formal systems are in place.

Emerging Power lists ISO 9001:2015 and AS9100:2016 among its current quality credentials.

These certifications should not replace your own supplier qualification process, but they can be an important part of evaluating a manufacturer’s overall quality-management framework.

5. Ask Exactly How Battery Packs Are Tested

One of the most useful questions an OEM can ask is:

What testing will be performed on our battery before it leaves production?

Do not settle for a general answer such as “all batteries are tested.”

Ask what is tested, at what stage, against which acceptance criteria, how results are recorded, and whether testing is performed on prototypes, production units, or both.

Depending on the design and application, validation may examine areas such as:

Voltage
Capacity
Charging behavior
Discharge performance
Protection functions
Current handling
Temperature behavior
Communication functions
Mechanical fit
Connector performance
Functional operation

Testing requirements should be established around the actual battery design and its intended application rather than copied from an unrelated product.

Emerging Power states that its battery development capabilities can include automated testing and custom end-of-line functional test solutions.

6. Understand Safety and Regulatory Requirements Early

Safety and regulatory planning should begin during battery development rather than after the design has been finalized.

The standards and certifications that apply depend on the battery configuration, end product, application, target market, and transportation requirements.

For example, lithium cells and batteries offered for transport may need to satisfy applicable UN 38.3 transportation testing requirements.

Depending on the application, other standards such as IEC or UL battery safety requirements may also need to be considered.

The important point is that there is no single certification checklist that applies identically to every lithium polymer battery project.

OEMs should ask a prospective manufacturer:

Which requirements apply to our battery?
Which requirements apply to the finished product?
What transportation testing is required?
At what stage should testing begin?
What documentation will be required?
Who coordinates third-party laboratory testing?
Could a future cell or design change require retesting?

Addressing these questions early can help reduce redesign and compliance problems later in development.

7. Check Traceability

Traceability becomes especially important when a battery is used in an OEM product expected to remain in production for years.

If a problem appears in the field, the manufacturer should ideally be able to determine which materials and production records are associated with the affected units.

Ask what information can be traced, including:

Cell lot
Critical components
Production date
Assembly location
Inspection records
Test results
Design revision

Traceability also makes it easier to investigate production problems and control changes throughout the product lifecycle.

8. Evaluate Prototype and First-Article Procedures

A custom lithium polymer battery should not move directly from an initial drawing into full production.

Prototype and first-article stages provide opportunities to confirm that the battery works correctly with the actual product.

Validation can include:

Mechanical fit → electrical performance → charging → thermal behavior → communication → protection functions → system integration

If problems appear during this stage, changes can be made before higher production volumes are committed.

Ask the manufacturer how it handles design reviews, prototypes, first articles, customer approval, and the transition into production.

9. Determine Whether the Manufacturer Can Maintain Consistency at Scale

Producing ten good batteries and producing thousands of consistent batteries are different manufacturing challenges.

OEMs should understand whether a potential partner can support the expected production volume without compromising testing, documentation, or process control.

Ask about:

Prototype capacity
Pilot production
High-volume manufacturing
Production lead times
Manufacturing locations
Capacity planning
Demand fluctuations
Supply interruptions
Alternate sourcing
End-of-line testing

Emerging Power currently lists manufacturing and assembly capabilities in the United States, Mexico, and Asia, allowing production strategies to be evaluated according to individual project requirements.

Learn more about Emerging Power’s battery manufacturing capabilities.

10. Look Beyond Unit Price

Unit price is important, but it should not be the only criterion used to compare lithium polymer battery manufacturers.

A lower initial quote can become expensive if the project later experiences:

Repeated engineering revisions
Inconsistent components
Certification delays
High defect rates
Supply interruptions
Field failures
Poor technical support
Unexpected redesign

OEMs should therefore consider the total value of engineering, quality control, testing, regulatory support, documentation, supply-chain management, and long-term production support.

For custom applications, the goal is not simply to purchase a battery. It is to develop a power system that can be manufactured consistently throughout the life of the product.

Lithium Polymer Battery Manufacturer Evaluation Checklist

Before approving a manufacturer, verify that you understand:

Where its lithium polymer cells are sourced
How incoming cells and components are qualified
Whether lot-level traceability is available
What electrical and mechanical engineering support is provided
How protection circuits and BMS requirements are handled
What quality-management systems are in place
Which tests are performed during development and production
How safety, transportation, and regulatory requirements are addressed
How prototypes and first articles are validated
Whether manufacturing can scale to your expected volume
How engineering changes are controlled
How cell obsolescence and supply disruptions are managed

A manufacturer that can provide clear, documented answers to these questions gives an OEM considerably more information to evaluate than a supplier offering only specifications and pricing.

Frequently Asked Questions

How do I evaluate a lithium polymer battery manufacturer?

Evaluate the manufacturer’s cell sourcing, engineering capabilities, quality-management systems, BMS and protection expertise, testing procedures, traceability, regulatory knowledge, production capacity, and long-term supply-chain support. The evaluation should cover the entire battery development and manufacturing process rather than price alone.

What should I ask a LiPo battery manufacturer?

Ask where its cells come from, how cells are qualified, what testing is performed, how production lots are traced, which quality certifications it maintains, how it handles BMS and protection design, what regulatory support is available, and whether it can support both prototypes and production quantities.

Does every lithium polymer battery need a BMS?

Not necessarily in the same form. Battery management and protection requirements depend on the cell configuration, application, charging system, and product requirements. A qualified battery engineer should determine which protection and management functions are appropriate for the specific design.

Is UN 38.3 required for lithium polymer batteries?

Lithium cells and batteries offered for transport are subject to applicable transportation requirements, and UN 38.3 testing is an important part of lithium battery transportation compliance. The exact requirements should be evaluated for the specific battery, configuration, shipping method, and destination.

Are lithium polymer batteries suitable for custom battery packs?

Yes. Lithium polymer cells can be particularly useful for products requiring lightweight or compact battery configurations. However, suitability depends on the application’s voltage, capacity, current, temperature, mechanical, safety, lifecycle, and regulatory requirements.

Final Thoughts

The best way to evaluate lithium polymer battery manufacturers is to look beyond the battery specification sheet.

Cell quality matters, but so do engineering, protection electronics, testing, manufacturing controls, documentation, traceability, compliance support, and the ability to maintain consistent production over time.

For OEMs, these factors can have a direct impact on product development, certification, field reliability, and long-term supply continuity.

A capable battery manufacturing partner should be able to explain not only what battery it can build, but also how the battery will be designed, tested, documented, manufactured, and supported throughout the product lifecycle.

Discuss Your Lithium Polymer Battery Requirements With Emerging Power

Developing a custom Li-Polymer battery for an OEM application?

Emerging Power provides custom battery design and manufacturing support, including cell selection, electrical and mechanical design, BMS and protection solutions, testing, regulatory support, and production.

Explore Emerging Power’s custom battery design capabilities or contact the team to discuss your voltage, capacity, form factor, operating environment, testing, and production requirements.

3D Modeling for 3D Printing in Battery Development

Developing a custom battery pack involves much more than selecting cells and connecting them to a battery management system. The battery also has to fit within the product, accommodate electronics and wiring, meet mechanical requirements, provide access to connectors, and ultimately work within the OEM’s finished assembly.

That is where 3D modeling for 3D printing can become an important part of battery development.

Instead of waiting until production tooling is created to discover a mechanical issue, engineers can develop a digital 3D model, convert that design into a physical prototype, evaluate the result, make changes, and print another version.

This iterative approach can help identify mechanical and integration issues earlier in the development process and complements a structured custom battery pack design workflow.

For OEMs developing custom battery-powered products, moving efficiently from 3D model to physical prototype can reduce unnecessary design iterations later in the project and provide engineers with something they can physically inspect before committing to production.

What Is 3D Modeling for 3D Printing?

3D modeling is the process of creating a digital representation of a physical component using computer-aided design (CAD) software.

For battery development, a 3D model may represent:

The battery pack enclosure
Individual cells or cell groups
Battery management system components
Printed circuit boards
Connectors
Wiring and cable routing
Mounting points
Fasteners
Internal supports
Product interfaces

Once the model is ready, the digital design can be prepared for additive manufacturing, commonly known as 3D printing.

Unlike traditional subtractive manufacturing, where material is removed from a larger piece, additive manufacturing generally builds a component layer by layer according to digital design data.

According to the National Institute of Standards and Technology’s guide to additive manufacturing and 3D printing, additive manufacturing can support rapid prototyping, faster design iteration, customization, and the production of complex geometries.

For engineers, the important advantage is simple: a digital battery design can become a physical component that can be examined, assembled, measured, and revised.

Why Is 3D Modeling Important in Battery Development?

A battery pack must satisfy both electrical and mechanical requirements.

Engineers may identify an appropriate chemistry, voltage, capacity, discharge rate, and protection system, but the resulting battery still has to work within the physical constraints of the OEM’s product.

That introduces questions such as:

Does the battery fit within the available space?
Is there sufficient clearance around components?
Can the connector be reached easily?
Is there enough room for wiring?
Are mounting points positioned correctly?
Can the battery be installed and removed as intended?
Does the enclosure interfere with another component?
Can the pack be assembled efficiently?

A CAD model gives engineers an opportunity to examine these relationships digitally.

A 3D printed battery prototype takes the process a step further by allowing the design team to evaluate the geometry as a physical object.

That transition from screen to physical prototype can expose practical issues that may be difficult to recognize from drawings alone.

Emerging Power’s smart battery design capabilities include mechanical 3D design for enclosures, turnkey designs, manufacturing fixtures, component drawings, and assembly documentation.

How Does 3D Modeling Speed Up Battery Development?

1. It Brings Mechanical Design Into the Process Earlier

Mechanical constraints should not be an afterthought in custom battery development.

The size and arrangement of cells, electronics, wiring, connectors, enclosure features, and mounting hardware can all influence the final battery configuration.

By developing a 3D model early, engineers can evaluate how these components interact before the design reaches production.

Emerging Power’s 3D printing capabilities can support this transition from digital design to physical prototype as part of the wider engineering process.

Bringing mechanical work into the development process earlier can help reduce the risk of discovering major fit or packaging issues after the design has advanced.

2. Engineers Can Move From CAD to a Physical Prototype Faster

Traditional prototype methods can require machining, fabrication, molds, or dedicated tooling.

For appropriate applications, 3D printing can remove some of those early tooling requirements.

Once a printable model has been prepared, a prototype can be produced directly from the digital design. If engineers identify a problem, they can modify the CAD file and create another version.

The development cycle becomes:

Model → Print → Evaluate → Modify → Reprint

rather than committing immediately to production tooling.

NIST identifies rapid prototyping and design iteration as important benefits of additive manufacturing because manufacturers can bypass some of the lead time and expense associated with tooling during development.

3. Physical Fit Can Be Checked Before Production

One of the most practical uses of 3D printing in battery development is evaluating form and fit.

A prototype enclosure can help engineering teams determine whether the battery’s physical dimensions work with the intended product.

For example, an OEM may need a battery pack to fit inside a compact industrial device while leaving sufficient space for:

A PCB
Connectors
Sensors
Wiring
Mounting hardware
Other internal components

A 3D printed enclosure can provide a physical representation of the proposed geometry.

If the enclosure is too large, a connector is poorly positioned, or installation is difficult, engineers have an opportunity to revise the design before moving further into manufacturing.

For projects where enclosure, electronics, chemistry, and certification need to be considered together, Emerging Power’s custom battery pack design checklist provides additional guidance on structuring the development process.

4. Complex Battery Enclosures Can Be Evaluated More Efficiently

Custom battery applications do not always fit standard rectangular housings.

Medical equipment, military systems, communications devices, instrumentation, industrial products, and portable electronics may impose strict space and packaging requirements.

3D modeling gives engineers greater freedom to investigate:

Irregular enclosure shapes
Internal support structures
Connector locations
Mounting features
Cell positioning
Cable paths
Component clearances

This is particularly useful when the battery must be designed around an existing product rather than the product being designed around a standard battery.

The result can be a more integrated approach to custom battery pack design.

For applications requiring high energy density and rechargeable power, engineers may also evaluate configurations involving custom lithium-ion battery packs alongside mechanical enclosure requirements.

5. Design Changes Can Be Tested Before Tooling

Production tooling represents a much larger commitment than changing a digital model.

Suppose a prototype reveals that a mounting feature needs to move several millimeters or that a connector opening needs additional clearance.

At the CAD stage, engineers can revise the model and produce another prototype.

If the same problem is discovered only after production tooling has been completed, correcting it may require significantly more rework.

This is one reason rapid prototyping is valuable: its purpose is not simply to make a sample. It creates an opportunity to find and address design issues while the product is still relatively easy to modify.

The broader manufacturing industry uses additive manufacturing for the same reason. The U.S. Department of Energy’s additive manufacturing resources discuss the role of additive manufacturing in advanced production and component development.

6. 3D Models Improve Communication Between Engineering Teams

Battery projects often involve multiple groups, including:

OEM product engineers
Battery engineers
Mechanical engineers
Electrical engineers
Manufacturing teams
Quality teams
Suppliers

A shared 3D model gives these groups a common representation of the proposed design.

Instead of relying entirely on written descriptions or two-dimensional drawings, teams can evaluate the geometry and component relationships more directly.

A physical prototype can make communication even easier.

Teams can point to specific features, test how parts interact, and document required changes before the next design iteration.

From 3D Model to Battery Prototype: A Typical Development Process

Although every battery project has different requirements, a 3D-modeling and prototyping workflow may look like this:

Step 1: Define the Battery Requirements

The process begins with understanding the product and battery requirements.

These may include:

Voltage
Capacity
Current requirements
Runtime
Battery chemistry
Physical dimensions
Weight restrictions
Operating environment
Connector requirements
Charging requirements
BMS requirements
Regulatory considerations

Mechanical and electrical requirements need to be considered together.

Step 2: Develop the Preliminary Battery Design

Once the requirements are understood, engineers can begin defining the pack architecture.

This may involve selecting cells, determining cell configuration, planning protection electronics or BMS requirements, and establishing preliminary mechanical dimensions.

Emerging Power’s battery project management process progresses through initial review, preliminary design, design and development, and first articles before production approval.

Step 3: Create the 3D CAD Model

The battery enclosure and related mechanical components are then modeled digitally.

The model allows engineers to evaluate component positioning and overall geometry before a physical part is created.

Step 4: Prepare the Model for 3D Printing

The CAD model is converted into a format that can be processed by the selected additive manufacturing system.

The design is digitally divided into layers, and the 3D printer builds the component according to those instructions.

Material and printing-process selection depend on what the prototype is intended to demonstrate.

A prototype designed primarily to verify dimensions may have different requirements from one intended for more extensive mechanical evaluation.

Step 5: Evaluate the Physical Prototype

Once printed, engineers can evaluate characteristics such as:

Overall dimensions
Product fit
Cell positioning
Connector placement
Component clearance
Mounting locations
Assembly sequence
Accessibility

Issues identified during this stage can be documented and returned to the CAD model.

Step 6: Revise and Repeat

If changes are needed, engineers modify the digital design and create another prototype.

This ability to iterate is one of the most important advantages of combining 3D modeling with rapid prototyping.

Instead of treating the first design as final, engineers can progressively refine the product.

Step 7: Move Toward First Articles and Production

Once the design reaches the required level of maturity, the project can advance toward first articles, testing, customer approval, tooling where required, and eventually production.

This structured approach helps connect prototype development with actual manufacturing rather than treating 3D printing as a standalone activity.

Does a 3D Printed Prototype Replace Battery Testing?

No.

A 3D printed prototype is an engineering tool, not proof that a completed battery system satisfies every performance, safety, environmental, or regulatory requirement.

Depending on the application, additional evaluation may include:

Electrical testing
Functional testing
Thermal testing
Mechanical testing
Environmental testing
Battery management system validation
Transportation testing
Regulatory or industry-specific testing

For lithium batteries intended for transportation, relevant products may need to satisfy applicable UN 38.3 safety transportation testing requirements before shipment.

The prototype may help engineers evaluate mechanical design decisions before these later stages, but it should not be treated as a substitute for required design verification or compliance testing.

3D Modeling and Custom Battery Development at Emerging Power

Emerging Power supports OEM battery development with mechanical, electrical, prototyping, testing, and manufacturing capabilities.

Its mechanical engineering capabilities include 3D design for battery enclosures and related components, while its broader custom battery design services support projects from initial technical review through preliminary design, development, first articles, testing, and production.

For OEMs, this means 3D modeling does not have to operate as an isolated design activity.

It can be incorporated into the larger battery development process alongside:

Cell selection
Electrical design
Battery management systems
Enclosure engineering
Prototype development
Testing
Documentation
Manufacturing planning

Learn more about Emerging Power’s 3D printing and prototyping capabilities for custom battery development.

Final Thoughts

The biggest advantage of 3D modeling for 3D printing in battery development is not simply the ability to print a component.

It is the ability to evaluate and improve a design before making larger manufacturing commitments.

A digital model can be turned into a physical prototype, evaluated, modified, and produced again. That gives engineering teams a practical way to investigate fit, packaging, component placement, assembly, and enclosure design while changes are still relatively easy to make.

For OEMs developing custom battery-powered products, integrating 3D modeling and rapid prototyping into the engineering workflow can create a more efficient path from initial concept to a production-ready battery design.

Talk to Emerging Power About Your Battery Project

Need support developing a custom battery pack or prototype?

Emerging Power provides custom battery design, mechanical and electrical engineering, 3D modeling, prototyping, testing support, and manufacturing services for OEM applications.

Request a custom battery design quote to discuss your battery development requirements.

Frequently Asked Questions

What is 3D modeling for 3D printing?

3D modeling for 3D printing is the process of creating a digital three-dimensional CAD model that can be converted into instructions for an additive manufacturing system. The printer then builds the physical component layer by layer.

How is 3D printing used in battery development?

3D printing can be used during battery development to create prototype enclosures, housings, fixtures, and other mechanical components. These prototypes can help engineers evaluate dimensions, fit, component placement, mounting features, and assembly before moving toward production.

Can 3D printing speed up battery prototyping?

Yes. For suitable components, 3D printing allows engineers to produce prototypes directly from digital models without first creating conventional production tooling. This can make it easier to test and revise early-stage designs.

Why use a 3D printed battery enclosure prototype?

A prototype enclosure gives engineers a physical representation of the proposed battery design. It can help reveal issues involving fit, connectors, wiring, mounting points, component clearances, and assembly before the final production process is selected.

Can 3D printing be used for custom battery packs?

3D printing can support custom battery pack development by producing prototype mechanical components and helping engineers evaluate custom geometries. The appropriate printing process and material depend on the design requirements and intended purpose of the prototype.

Does a 3D printed battery prototype replace final testing?

No. A prototype can support design evaluation, but the finished battery may still require electrical, mechanical, thermal, environmental, safety, transportation, and regulatory testing depending on its chemistry, application, and target market.

Why OEMs Are Choosing U.S.-Based Battery Manufacturers

For OEMs developing battery-powered products, selecting a battery manufacturer is no longer simply a matter of finding the lowest unit price.

Why OEMs Are Choosing U.S.-Based Battery Manufacturers

For OEMs developing battery-powered products, selecting a battery manufacturer is no longer simply a matter of finding the lowest unit price.

Engineering support, supply chain resilience, quality control, traceability, communication, lead times, regulatory requirements, and the ability to move efficiently from prototype to production can all influence the success of a battery program.

That is one reason more OEM teams are evaluating U.S.-based battery manufacturers as part of their sourcing strategy.

NIST has identified supply chain resilience as an important issue for U.S. manufacturers and notes that bringing manufacturing closer to home can improve responsiveness and reduce exposure to international disruptions. At the same time, the U.S. Department of Energy continues to support expansion of domestic battery manufacturing and critical-material supply chains.

For OEMs, however, choosing a domestic battery manufacturer is not simply about where a battery is assembled.

The more important question is:

Can the manufacturer provide the engineering, quality, manufacturing, traceability, and long-term support required for the product?

Here are the factors driving OEM interest in U.S.-based battery manufacturing.

Why Are OEMs Moving Toward U.S.-Based Battery Manufacturers?

OEMs may choose U.S.-based battery manufacturers to gain closer engineering collaboration, greater supply chain visibility, easier communication, stronger quality oversight, and more responsive production support.

This can be particularly important when developing custom battery packs for medical equipment, industrial systems, communications equipment, UAVs, military applications, instrumentation, and other products with specialized requirements.

The battery is often deeply integrated into the finished product. Voltage, capacity, discharge requirements, physical dimensions, BMS functionality, connectors, charging, temperature range, testing, and certification requirements may all need to be considered together.

Working more closely with the manufacturer can therefore become an engineering advantage rather than simply a sourcing preference.

1. Supply Chain Resilience Has Become a Bigger Priority

For years, manufacturers optimized global supply chains primarily around cost and scale.

Recent disruptions have made resilience, supplier visibility, logistics, and continuity increasingly important considerations.

NIST’s Manufacturing Extension Partnership notes that reshoring is being driven in part by an increased emphasis on supply chain resiliency. Bringing manufacturing closer to the end customer can reduce certain risks and improve responsiveness.

For an OEM, this does not mean every component must originate in the United States. The global battery industry remains highly interconnected, and battery cells, electronics, raw materials, and other components can originate from multiple countries.

Instead, OEMs should evaluate where critical engineering, assembly, testing, quality control, and supplier management occur.

A U.S.-based battery manufacturing partner may help an OEM create a supply chain with greater visibility and more direct communication when disruptions occur.

External resource: NIST Manufacturing Extension Partnership — Supply Chain and Reshoring Guidance.

2. Faster Engineering Communication

Custom battery development is rarely a simple purchase-order transaction.

Engineers may need to discuss:

Voltage and capacity
Continuous and peak current
Runtime requirements
Cell chemistry
Battery Management System (BMS)
PCB design
Charging
Mechanical dimensions
Connectors
Communications
Operating temperature
Environmental conditions
Regulatory requirements
Prototype testing

When the OEM’s engineering team and battery manufacturer’s engineering team can communicate directly, questions can often be addressed earlier in the design process.

This becomes particularly valuable during prototype development and design revisions.

Emerging Power’s custom battery design services include support for battery architecture, BMS and PCB requirements, enclosures, testing, regulatory considerations, and custom programming.

The objective is not simply faster communication.

It is faster technical decision-making with fewer misunderstandings between design and manufacturing teams.

3. Better Control During Prototype-to-Production Development

A custom battery should not move directly from an initial specification into full production.

Most OEM programs move through several stages:

Requirements → Preliminary Design → Engineering → Prototype / First Article → Testing → Approval → Production

Each stage can reveal issues that require changes.

For example, prototype testing might identify:

Unexpected thermal behavior
Mechanical fit issues
Connector problems
BMS communication changes
Runtime differences
Charging issues
Environmental limitations

Working with a manufacturer that provides engineering and production support can help maintain continuity as the project progresses.

Emerging Power’s project management process follows a structured development workflow that includes initial technical review, preliminary design, design and development, first articles, customer testing, and production approval.

This type of process is especially valuable when the battery is a critical subsystem rather than a replaceable commodity component.

4. Quality and Traceability Matter More for Critical Applications

Battery quality is important for every product, but the consequences of failure vary considerably by application.

A battery used in a medical device, military system, industrial instrument, communications platform, or UAV may operate under demanding conditions and require tighter controls than a basic consumer application.

Supply chain traceability is also becoming increasingly important.

In 2026, the National Institute of Standards and Technology published its Supply Chain Traceability Principles: A Manufacturing Meta-Framework, highlighting the importance of product provenance and verifiable traceability across increasingly complex manufacturing supply chains.

For OEM procurement and quality teams, useful questions include:

Where are the battery cells sourced?
Are components traceable?
How are incoming materials controlled?
What production tests are performed?
How are design revisions documented?
What quality systems does the manufacturer maintain?
How are nonconforming components handled?
What happens if a specified cell becomes unavailable?

The lowest battery price means little if quality or traceability problems create field failures, redesigns, recalls, or production interruptions.

5. Domestic Engineering Can Simplify Custom Battery Development

Many OEM products cannot use a standard battery pack.

The product may require a specific combination of:

Voltage + Capacity + Size + Weight + Current + Temperature + Communication + Safety

This can require a fully custom solution.

A capable custom lithium-ion battery pack manufacturer can support more than cell assembly.

Depending on the application, development may include:

Cell selection
Electrical architecture
BMS design
PCB development
Mechanical engineering
Custom enclosures
Connectors and wiring
Fuel-gauge functionality
Charging systems
Automated testing
Prototype development
Regulatory support

Having engineering and manufacturing teams working together can also help identify manufacturability issues before a design reaches high-volume production.

6. OEMs Want Greater Supply Chain Visibility

Supply chain visibility has become increasingly important for manufacturers managing long product lifecycles.

A product may remain in production for years, while individual battery cells and electronic components can change, become constrained, or reach end-of-life.

OEM teams therefore need to think beyond the first production order.

They should ask:

What happens if a critical battery component becomes unavailable two years from now?

A strong battery manufacturing partner should help manage component sourcing and communicate changes that could affect the approved battery design.

This is especially important because switching cells is not always a simple substitution. Different cells can have different electrical, thermal, mechanical, and certification characteristics.

The battery manufacturer therefore becomes part of the OEM’s broader supply chain risk-management strategy.

7. Regulatory and Testing Support Can Begin Earlier

Lithium battery compliance should be considered during development rather than after the battery design has been finalized.

Changing a cell, pack configuration, enclosure, or other significant component late in the process can create additional testing and validation requirements.

OEM teams should identify relevant transportation, safety, industry, and end-market requirements early.

For example, lithium cells and batteries offered for transport are subject to the testing provisions of UN 38.3.

A manufacturer experienced with battery testing and regulatory requirements can help OEM teams identify these considerations during development rather than discovering them near product launch.

Emerging Power’s custom battery pack design checklist provides a structured overview of cell selection, BMS design, mechanical engineering, testing, and certification considerations.

8. U.S. Battery Manufacturing Is Receiving Strategic Attention

Domestic battery manufacturing has also become a broader U.S. supply-chain priority.

In August 2026, the U.S. Department of Energy announced $500 million for seven selected projects intended to expand U.S. critical-mineral processing, battery manufacturing, and recycling capacity.

For OEMs, government investment does not automatically make a domestic supplier the right supplier.

However, it demonstrates the strategic importance being placed on developing greater domestic battery and critical-material capabilities.

OEM sourcing teams should still evaluate each manufacturer based on engineering capability, quality systems, production capacity, supply chain, certifications, testing capabilities, and application experience.

External resource: U.S. Department of Energy — Critical Mineral and Battery Supply Chain Manufacturing Initiatives.

9. Domestic Does Not Mean the Entire Supply Chain Is Domestic

This distinction is important.

A U.S.-based battery manufacturer is not necessarily the same as a battery manufactured entirely from U.S.-origin materials and components.

The lithium-ion battery supply chain is global.

Cells, electronic components, raw materials, connectors, and other components may originate internationally even when battery engineering, pack assembly, testing, or manufacturing takes place in the United States.

OEM buyers should therefore avoid relying on a “U.S.-based” label alone.

Instead, ask the manufacturer to explain:

Where engineering occurs
Where packs are assembled
Where cells are sourced
What alternative cell sources are available
Where testing occurs
How components are traced
What manufacturing locations may be used
How supply disruptions are managed

That creates a much more useful sourcing comparison.

10. When Does a U.S.-Based Battery Manufacturer Make the Most Sense?

Domestic battery manufacturing can be particularly valuable when a project requires substantial engineering interaction or has demanding quality, documentation, or production requirements.

Examples include:

Medical Equipment

Medical OEMs may need strict documentation, repeatable production, controlled components, and long-term product support.

Military and Defense Systems

Defense applications may involve specialized environmental, documentation, traceability, manufacturing, or regulatory requirements.

Industrial Equipment

Industrial batteries may need to withstand temperature extremes, vibration, high current, long duty cycles, or unusual mechanical environments.

UAV and Drone Systems

UAV battery packs often require careful optimization of weight, energy density, discharge performance, thermal behavior, and mechanical packaging.

Communications and Instrumentation

These applications may require custom form factors, intelligent BMS functionality, specialized connectors, or long product lifecycles.

In each case, the value of the manufacturer extends beyond assembling cells.

The manufacturer becomes part of the product-development team.

How Should OEMs Evaluate a U.S.-Based Battery Manufacturer?

Before selecting a domestic battery supplier, evaluate its capabilities rather than choosing based on location alone.

Ask:

Does the manufacturer provide in-house engineering support?
Can it develop both electrical and mechanical battery systems?
Does it have BMS and PCB design capabilities?
Which battery chemistries does it support?
Where does it source cells and critical components?
What quality certifications does it maintain?
Can it support prototype, pilot, and production quantities?
What testing capabilities are available?
Can it assist with regulatory requirements?
How does it manage component obsolescence and supply interruptions?
Where will your specific battery pack actually be manufactured?
Can it support the product throughout its expected lifecycle?

For additional guidance, see Emerging Power’s article on how to choose the right custom battery pack manufacturer.

Why OEMs Work With Emerging Power

Emerging Power provides custom and standard battery solutions for OEM applications.

The company’s primary R&D, development, and manufacturing operations are based in New Jersey, while its broader manufacturing capabilities include facilities in the U.S., Mexico, and Asia.

Its capabilities include:

Custom battery pack design
Lithium-ion and other battery chemistries
BMS and PCB development
Mechanical and enclosure design
Prototype development
Automated testing
Regulatory and certification support
Manufacturing and assembly
Supply chain support

Emerging Power also reports ISO 9001:2015 and AS9100:2016 certification and works with OEM applications across medical, military, communications, instrumentation, industrial, and other markets.

OEM teams can review Emerging Power’s battery manufacturing and engineering capabilities to determine which services align with their project requirements.

Frequently Asked Questions

Why are OEMs choosing U.S.-based battery manufacturers?

OEMs may choose U.S.-based battery manufacturers for closer engineering collaboration, improved communication, greater supply chain visibility, quality oversight, prototype support, and more responsive manufacturing. The importance of each factor depends on the product and its requirements.

Are U.S.-manufactured battery packs more expensive?

Not necessarily in terms of total program cost. Unit pricing may differ between domestic and overseas suppliers, but OEMs should also evaluate engineering costs, freight, inventory, lead times, quality, testing, redesign risk, supply interruptions, and lifecycle support.

Does U.S.-based manufacturing mean all battery components are made in America?

No. A battery pack may be engineered, assembled, or tested in the United States while using cells or other components sourced internationally. OEMs should ask manufacturers for specific information about component sourcing and manufacturing locations.

What should OEMs look for in a domestic battery manufacturer?

OEMs should evaluate engineering capabilities, cell sourcing, BMS expertise, mechanical design, quality systems, testing, certification support, traceability, manufacturing capacity, supply chain management, and long-term product support.

Can a U.S. battery manufacturer design custom lithium-ion battery packs?

Yes. Custom battery manufacturers can design packs around application-specific voltage, capacity, current, size, weight, temperature, BMS, charging, connector, communication, and environmental requirements.

Is domestic battery manufacturing better for supply chain resilience?

Domestic manufacturing can reduce some logistics and communication risks and may improve responsiveness, but location alone does not guarantee supply chain resilience. OEMs should also evaluate cell sourcing, component availability, alternative suppliers, inventory strategy, production capacity, and risk-management processes.

The Bottom Line

OEMs are reconsidering how battery sourcing affects the complete product lifecycle.

Price remains important, but it is only one part of the decision.

Engineering collaboration, quality, traceability, supply chain visibility, testing, communication, and long-term manufacturing support can be equally important when a battery is a critical part of the finished product.

For products requiring custom battery engineering, a U.S.-based battery manufacturer can provide closer collaboration from initial requirements through prototype development and production.

The key is not simply choosing a domestic supplier.

It is choosing a battery partner with the technical, quality, manufacturing, and supply chain capabilities required for the application.

Looking for a U.S.-Based Custom Battery Manufacturer?

Emerging Power supports OEM battery projects from technical review and custom battery design through prototypes, testing, and production.

Request a Custom Battery Pack Quote to discuss your voltage, capacity, form factor, BMS, operating environment, testing, and production requirements.

How Much Does a Custom Battery Pack Cost?

There is no single price for a custom battery pack. Custom battery pack cost depends on the cells, pack configuration, BMS and electronics, enclosure, engineering, tooling,

How Much Does a Custom Battery Pack Cost?

There is no single price for a custom battery pack. Custom battery pack cost depends on the cells, pack configuration, BMS and electronics, enclosure, engineering, tooling, prototypes, testing, certification requirements, and production volume. For OEM projects, it is important to separate one-time development expenses from recurring per-unit production costs.

A simple battery assembly using an established design may require relatively little customization. A battery for a medical device, industrial system, drone, communications product, or defense application may require custom electronics, mechanical engineering, software, testing, and regulatory work.

That is why asking, “How much does a custom battery cost?” without defining the application is a little like asking how much it costs to manufacture a product without having its specifications.

The better question is: What requirements are driving the cost of my battery pack?

How Is a Custom Battery Pack Price Calculated?

A custom battery quote typically combines one-time development costs, recurring unit costs, and applicable testing or certification expenses.

Development expenses can include engineering, BMS or PCB development, mechanical design, prototypes, tooling, and test development. Recurring production expenses typically include battery cells, electronics, enclosure components, connectors, assembly, production testing, and packaging.

Because each application changes these inputs, an accurate custom battery pack price normally requires a project-specific technical review.

Emerging Power’s battery design and production process includes technical review, preliminary design, engineering and development, first articles, customer testing, and production approval.

What Determines Custom Battery Pack Cost?

A custom battery pack is more than a group of cells. Its total cost reflects the electrical, mechanical, safety, performance, and production requirements of the finished system.

Here are the major cost drivers.

1. Cell Chemistry and Cell Selection

Cells are one of the most important recurring costs in a battery pack.

The appropriate chemistry depends on requirements such as energy density, discharge rate, operating temperature, expected cycle life, physical dimensions, and safety.

For applications requiring higher voltage, current, or energy density, Emerging Power develops custom lithium-ion battery packs around the requirements of the end product.

Higher-performance or specialized cells can affect both material costs and engineering requirements, so cell selection should be evaluated as part of the complete system rather than simply by comparing individual cell prices.

2. Battery Capacity, Voltage and Pack Configuration

A battery requiring more energy generally needs more cells or higher-capacity cells, but cost is not determined by capacity alone.

Voltage, peak current, continuous current, series/parallel configuration, runtime, charging requirements, and thermal behavior can all influence the design.

A compact high-discharge pack for a drone, for example, can present different engineering challenges from a battery designed for a lower-power industrial instrument.

Emerging Power’s custom battery pack design checklist explains why requirements such as voltage, capacity, load profile, temperature range, size, and expected product life should be defined early in the development process.

3. BMS and Electronics

For many rechargeable custom packs, the Battery Management System (BMS) is an important part of both safety and cost.

Depending on the application, electronics may need to manage:

Overcharge and over-discharge protection
Overcurrent protection
Temperature monitoring
Cell balancing
State-of-charge information
Communication with the host device
Charging behavior

A basic protection circuit is very different from a sophisticated BMS with communications and custom programming.

Emerging Power’s custom battery design services can include BMS and PCB development, charging circuits, automated testing, and other engineering requirements based on the application.

4. Mechanical Design and Enclosure

The battery must physically fit and operate safely inside the end product.

A project may therefore require a custom enclosure, connectors, wiring, mounting features, insulation, seals, or mechanical protection.

Environmental requirements can increase complexity further. A battery used in a rugged industrial product or UAV may face vibration, temperature, shock, weight, or space constraints that a standard commercial battery does not.

For applications where size, weight, discharge performance, and environmental conditions are particularly important, reviewing the requirements for custom drone and UAV battery packs provides a useful example of how application requirements influence battery design.

Mechanical decisions should therefore be made alongside electrical design rather than after the battery architecture has already been finalized.

5. Engineering and NRE

One of the most misunderstood parts of custom battery pack pricing is non-recurring engineering, or NRE.

NRE covers development work required to create the battery rather than manufacture every production unit.

Depending on the project, this can include electrical engineering, mechanical design, PCB/BMS development, software, documentation, test development, and design revisions.

Emerging Power’s project management process separates considerations such as NRE, tooling, regulatory testing, and battery-pack production pricing during development.

For OEM buyers, these expenses should be evaluated separately from unit price.

6. Prototypes and First Articles

A custom battery generally should not move directly from a drawing into high-volume production.

Prototype and first-article builds allow the manufacturer and OEM to validate:

fit → electrical performance → thermal behavior → charging → communication → integration with the finished product

Emerging Power’s battery development process includes first-article battery packs for customer testing and approval before the project proceeds toward production.

Additional design iterations can increase development cost, but identifying an issue before mass production may prevent significantly more expensive rework later.

7. Testing and Certification

Testing can represent a meaningful portion of the initial project budget.

Requirements depend on the chemistry, application, destination markets, and transportation method.

For lithium cells and batteries, UN 38.3 is an important transportation-testing consideration. The UN Manual of Tests and Criteria contains the relevant lithium cell and battery testing provisions in subsection 38.3. UNECE

OEM teams evaluating lithium battery transportation requirements can consult the UNECE Manual of Tests and Criteria as a primary reference.

Depending on the application, other product-specific safety, transportation, or regulatory requirements may also apply.

Planning these requirements early is important because changing cells, configuration, or other major design elements later can lead to additional validation work.

8. Tooling

Custom mechanical components can require dedicated tooling.

Examples may include molded housings, fixtures, test equipment, and manufacturing aids.

Tooling is generally an upfront expense rather than something that should be interpreted entirely as part of the recurring battery unit cost.

This distinction becomes particularly important when comparing quotations from different battery manufacturers.

9. Production Volume

Volume can significantly affect battery pack manufacturing cost per unit.

Development, tooling, procurement, and manufacturing setup costs can be distributed across more units as production increases. Component purchasing and manufacturing processes may also become more efficient at higher volumes.

However, buyers should not evaluate a supplier solely on the lowest projected high-volume price.

Ask what pricing looks like across:

Prototype → Pilot → Initial Production → Forecast Production Volume

That provides a more realistic picture of total program economics.

One-Time Cost vs. Per-Unit Battery Cost

OEMs can make custom battery quotations easier to compare by separating costs into two categories.

One-Time / Development Costs	Recurring Production Costs
Engineering / NRE	Battery cells
BMS/PCB development	PCB/BMS components
Mechanical design	Enclosure and connectors
Tooling	Wiring and assembly
Prototype development	Production testing
Regulatory testing	Packaging
Test-system development	Manufacturing labor

A quote that appears expensive upfront may have lower production costs, while a low development quote may exclude tooling, certification, or engineering that will eventually be required.

Compare the total project scope, not simply the battery’s unit price.

How Can OEMs Control Custom Battery Pack Costs?

The most effective cost reductions often happen before production.

Start with clear electrical, mechanical, and environmental requirements. Avoid specifying performance the application does not actually need. Consider available cell formats before designing the final enclosure, and identify testing and certification requirements early.

Most importantly, treat the battery as part of the product architecture rather than a component added near the end of product development.

Following a structured custom battery pack design process can help OEM teams define critical requirements before engineering progresses too far.

Emerging Power’s development workflow begins with technical documentation and project requirements before moving into preliminary design, engineering, first articles, testing, and production.

That approach can help reduce unnecessary redesign later.

What Information Is Needed for an Accurate Battery Pack Quote?

If you are requesting custom battery pack pricing, prepare as much of the following information as possible:

Required voltage and capacity
Continuous and peak current
Desired runtime
Maximum dimensions and weight
Rechargeable or primary battery
Operating temperature range
Charging requirements
Connector requirements
Communication requirements
Environmental conditions
Required certifications or testing
Prototype quantity
Expected annual production volume

You do not necessarily need to know the exact cell or BMS architecture. An experienced battery engineering team can help translate product requirements into a practical battery design.

Once these requirements are defined, OEM teams can request a custom battery pack quote based on the actual application rather than relying on a generic per-pack estimate.

Frequently Asked Questions

How much does a custom battery pack cost?

There is no universal price. Custom battery pack cost depends on cell chemistry and quantity, voltage and capacity, BMS complexity, enclosure design, engineering, tooling, prototypes, testing, certification requirements, and production volume. OEMs should request a project-specific quotation rather than rely on a generic price estimate.

Why are custom battery packs more expensive than standard batteries?

A custom battery may require electrical engineering, electronics, mechanical design, prototypes, specialized components, testing, and tooling that an existing standard battery does not require. These development requirements contribute to the total cost of the program.

Does a BMS increase battery pack cost?

Yes. A BMS adds electronics and potentially engineering and software requirements to the battery system. The cost impact depends on functions such as protection, cell balancing, temperature monitoring, communications, state-of-charge reporting, and custom programming.

Does ordering more battery packs reduce the unit cost?

Higher production volumes can sometimes reduce per-unit manufacturing costs because setup and other fixed expenses are distributed across more units, while component procurement and manufacturing may become more efficient. Actual pricing depends on the design, materials, forecast, and production requirements.

What information does a manufacturer need to quote a custom battery?

A battery manufacturer will typically need voltage, capacity, load profile, physical dimensions, operating environment, charging requirements, connectors, communications requirements, required testing or certifications, prototype quantity, and expected production volume.

The Bottom Line

Custom battery pack cost is determined by the complete system, not the cells alone.

Cell chemistry, BMS complexity, enclosure design, engineering, tooling, prototypes, testing, and production volume all contribute to total program cost.

For OEMs, the most useful quotation separates one-time development expenses from recurring production costs and clearly defines the engineering, testing, tooling, and manufacturing services included.

Emerging Power supports OEM battery projects through its custom battery design and development capabilities, from defining technical requirements through development and production.

Need Pricing for a Custom Battery Pack?

Request a custom battery pack quote to discuss voltage, capacity, form factor, operating environment, testing requirements, and anticipated production volume.

How to Select the Right Lithium Cell Manufacturer for Your Custom Battery Project

How to Choose the Right Custom Battery Pack Manufacturer

How to Select the Right Lithium Cell Manufacturer for Your Custom Battery Project

Choosing the right Lithium Cell Manufacturer is one of the most important decisions when developing a custom battery solution. The quality of lithium cells directly impacts battery performance, safety, lifecycle, and long-term reliability.

Whether you are building medical equipment, industrial systems, drones, communication devices, or defense applications, selecting the right cell supplier helps ensure your battery pack meets the technical requirements of your application.

The lithium battery market continues to expand as industries move toward electrification and portable power solutions. According to the International Energy Agency (IEA) Global EV Outlook 2025, global lithium-ion battery demand continues to grow across transportation, energy storage, and industrial applications. This growth has increased the need for reliable battery partners that can provide consistent quality and engineering support.

A trusted battery partner does more than supply cells. They help design, test, and manufacture a complete battery solution.

1. Evaluate Cell Quality and Manufacturing Standards

The foundation of any battery pack is the lithium cell. A reliable Lithium Cell Manufacturer should have strict quality control processes and provide detailed information about:

Cell chemistry options such as Lithium Iron Phosphate (LFP), Lithium Nickel Manganese Cobalt (NMC), and other lithium-ion technologies
Energy density and cycle life
Safety certifications and testing documentation
Manufacturing consistency
Traceability of battery cells

Different applications require different cell characteristics. For example, a drone battery may prioritize high discharge rates and lightweight design, while a medical device battery may require long cycle life and high reliability.

Working with a manufacturer that understands these differences helps avoid performance issues later.

2. Choose a Partner With Custom Battery Design Experience

Many companies require more than an off-the-shelf battery. Standard batteries often come with limitations in size, shape, power output, and integration.

A professional custom lithium-ion battery designer evaluates your complete system requirements, including:

Voltage requirements
Capacity needs
Operating environment
Space limitations
Communication requirements
Safety requirements

A li ion custom battery is designed around the device rather than forcing the device to adapt around a standard battery.

This approach allows engineers to optimize battery performance while improving reliability and usability.

3. Review Engineering and Testing Capabilities

Selecting a supplier that only assembles battery packs may create challenges during development. A complete battery partner should have engineering capabilities covering:

Battery architecture design
Battery Management System (BMS) development
Thermal management
Mechanical enclosure design
Prototype development
Safety testing

Testing is especially important for applications exposed to demanding conditions.

The U.S. Department of Energy highlights battery safety, durability, and performance testing as critical areas in advancing lithium battery technologies. Proper validation helps ensure battery systems perform safely under real-world operating conditions.

4. Understand Custom Battery Pack Manufacturing Capabilities

A reliable custom lithium battery pack manufacturer should be able to support the entire product lifecycle, from initial concept to production.

Important capabilities include:

Design Support

The manufacturer should help select the right cells, configuration, electronics, and mechanical design.

Prototype Development

Before full production, prototypes allow engineers to validate performance and make improvements.

Production Scalability

The manufacturing process should support both small-volume prototypes and larger production requirements.

Quality Control

Every production battery pack should go through inspection and testing procedures to maintain consistency.

Companies using custom battery packs benefit from solutions specifically designed for their operational requirements rather than generic battery products.

5. Check Industry Experience and Application Knowledge

Battery requirements vary significantly between industries.

A supplier experienced in multiple sectors can better understand application challenges such as:

Medical equipment requiring dependable power
Industrial systems requiring long operational cycles
Drones requiring lightweight high-performance batteries
Military and communication equipment requiring rugged solutions

A manufacturer with application knowledge can recommend the right chemistry, configuration, and protection features.

6. Consider Supply Chain Reliability

The lithium battery supply chain has become increasingly important as demand grows. According to BloombergNEF’s Battery Price Survey 2024, lithium-ion battery prices have continued to decline over recent years due to improvements in manufacturing scale and supply chain development.

However, companies still need reliable suppliers that can maintain:

Stable cell sourcing
Consistent production quality
Documentation support
Long-term manufacturing partnerships

A dependable battery manufacturer should provide transparency throughout the development and production process.

7. Ask the Right Questions Before Selecting a Manufacturer

Before choosing a lithium battery partner, consider asking:

Do you provide custom battery design support?
Which lithium cell chemistries do you work with?
Can you develop prototypes?
What testing standards do you follow?
Can you support production scaling?
Do you provide engineering documentation?

These questions help identify whether a supplier can support your project beyond basic battery assembly.

Why Choosing the Right Lithium Battery Partner Matters

The right Lithium Cell Manufacturer provides more than battery cells. They provide engineering expertise, design support, testing capabilities, and manufacturing reliability.

A well-designed battery system improves device performance, reduces development risks, and ensures your product receives dependable power throughout its lifecycle.

For companies developing specialized equipment, partnering with an experienced custom lithium battery pack manufacturer can make the difference between a battery that simply works and one that performs reliably in real-world conditions.

Frequently Asked Questions

What does a Lithium Cell Manufacturer do?

A Lithium Cell Manufacturer produces lithium battery cells used in battery systems. They provide different cell chemistries, capacities, and performance characteristics based on application requirements.

How do I choose a custom lithium-ion battery designer?

Look for a designer with experience in battery architecture, BMS integration, prototype development, testing, and manufacturing support.

What are the benefits of using li ion custom battery solutions?

A li ion custom battery is designed specifically for your device requirements, allowing better fit, optimized performance, improved safety, and efficient power management.

Why are custom battery packs better than standard batteries?

Custom battery packs are engineered around specific voltage, capacity, size, environmental, and performance requirements instead of using a one-size-fits-all approach.

What industries use custom lithium battery packs?

Custom lithium battery solutions are commonly used in medical devices, drones, industrial equipment, communication systems, robotics, and defense applications.

Build a Battery Solution Designed for Your Application

From cell selection to final production, Emerging Power helps companies develop reliable custom lithium battery solutions engineered for their specific requirements.

Talk to our battery engineering team today to discuss your custom battery pack project.

Lithium-Ion Battery Supplier vs. Manufacturer: What’s the Difference?

How to Choose the Right Custom Battery Pack Manufacturer

Choosing a custom battery pack manufacturer is an important part of developing a battery-powered product. The battery affects the product’s size, weight, runtime, power output, safety, and operating life. For an OEM, the right manufacturer should do more than assemble cells. The manufacturer should be able to understand the product requirements, select suitable cells, design the electrical and mechanical parts of the pack, develop the battery management system when needed, test the design, and support production. This is especially important when the battery will be used in medical equipment, industrial products, communications equipment, military systems, tracking devices, or other products with specific operating requirements. Recent developments in battery safety and manufacturing also make it important to consider testing, transportation requirements, cell sourcing, and regulatory requirements early in the design process.

What Does a Custom Battery Pack Manufacturer Do?

A custom battery pack manufacturer designs a battery around the requirements of a specific product. A custom battery may need a specific voltage, capacity, current output, physical size, connector, charging system, communication interface, or operating temperature range. The manufacturer may also design the battery management system (BMS), protection circuit, printed circuit board (PCB), enclosure, wiring, and other components. The process usually starts with the OEM’s requirements. The manufacturer then develops a preliminary design, builds prototypes, performs testing, makes design changes when needed, and moves the approved design into production. Emerging Power describes a similar process for its custom battery projects, beginning with an initial technical review and preliminary design and continuing through development, first-article production, customer testing, and production approval.

Why Is Choosing the Right Battery Manufacturer Important?

The battery is part of the product’s overall system. A problem with the battery can affect the performance or reliability of the finished product. For example, the battery needs to provide enough current during normal operation and during short periods of high demand. It also needs to operate within the temperature and environmental conditions expected for the product. The physical design matters as well. A battery that is electrically suitable may not fit the available space or may not provide the required connector or mounting arrangement. This is why OEMs should evaluate the manufacturer’s engineering capabilities, testing process, quality controls, supply chain, and production capacity, rather than comparing suppliers on battery price alone.

7 Factors to Consider When Choosing a Custom Battery Pack Manufacturer

1. Look at the Manufacturer’s Engineering Capabilities

The first question to ask is simple: Can the manufacturer design a battery around our product? A capable custom battery manufacturer should be able to review requirements such as:

Voltage
Capacity
Peak and continuous current
Runtime
Charge requirements
Operating temperature
Physical dimensions
Weight
Connector requirements
Environmental conditions
Expected production quantity
Applicable safety and transportation requirements

The manufacturer should also be able to explain why a particular cell, chemistry, pack configuration, or BMS design is appropriate. Emerging Power currently states that its engineering capabilities include mechanical design, electrical design, protection circuits, fuel gauges, charger-control PCB assemblies, and battery management systems.

Ask Where the Cells Come From

The quality and availability of the cells are important parts of a battery pack project. Ask the manufacturer:

Which cell suppliers do you use?
How are cells qualified?
How are incoming cells inspected?
Can battery components be traced to production lots?
What happens if a cell becomes unavailable?
Can you recommend an alternative cell without redesigning the entire product?

A good manufacturer should be able to discuss cell sourcing openly. Emerging Power states that it maintains relationships with major cell manufacturers, including Panasonic, Samsung, Moli Energy, LG, and Sony. It also lists support for lithium-ion, lithium-polymer, lithium iron phosphate, lithium primary, NiMH, and other battery chemistries. The right chemistry depends on the product. There is no single battery chemistry that is best for every application.

3. Check the BMS and Protection Design

For many rechargeable battery applications, the battery management system is an important part of the pack. A BMS can monitor battery conditions such as voltage, current, and temperature. Depending on the design, it can also manage cell balancing and provide protection against conditions such as overcharge, over-discharge, overcurrent, and short circuits. The exact BMS requirements depend on the chemistry, cell configuration, application, and product design. When evaluating a manufacturer, ask whether it can design or integrate the BMS instead of requiring the OEM to source the battery electronics separately. Emerging Power says its custom battery design services can include BMS, charging circuits, automated testing, and custom software for end-of-line functional testing.

4. Ask About Testing and Safety

Testing should be part of the development process, not something considered after production begins. The appropriate tests depend on the battery and its end application. They may include electrical, mechanical, environmental, temperature, charging, discharge, protection, and production tests. UL Solutions currently lists battery safety standards and testing services including UL 1642, UL 2054, UL 2056, UL 2271, and UL/IEC 62133-1 and 62133-2. The applicable standard depends on the particular battery and product. UL Solutions also notes that battery requirements can vary depending on the finished product and battery construction. For example, UL 1642 generally applies to lithium cells and batteries, while other standards may apply to rechargeable battery packs. This is why a battery manufacturer should be able to identify the standards that apply to your specific product rather than simply saying that a battery is “certified.”

5. Consider Transportation Requirements Early

Transportation requirements should also be discussed during battery development. Lithium batteries are regulated for transportation, and the requirements can affect product testing, packaging, documentation, and shipping. Emerging Power published a June 2026 guide explaining UN 38.3 testing and why transportation compliance should be considered by OEM manufacturers during battery development.UL Solutions also notes that lithium-ion and lithium-metal batteries are regulated as dangerous goods under applicable transportation requirements. If your products will be shipped within the United States or internationally, ask the manufacturer what transportation testing and documentation will be required.

6. Check Quality Systems and Manufacturing Controls

A battery design can be good on paper and still have problems if production controls are weak. Ask potential manufacturers about:

Quality certifications
Production inspection
Cell and component traceability
Automated testing
Engineering change control
First-article inspection
Production documentation
Defect handling
Supplier qualification

Emerging Power currently lists ISO 9001:2015 and AS9100:2016 certification among its capabilities. It also lists manufacturing and assembly facilities in the U.S., Mexico, and Asia. For an OEM, these details matter because the goal is not just to produce one working prototype. The manufacturer needs to produce consistent battery packs over the life of the product.

7. Make Sure the Manufacturer Can Scale With You

A manufacturer may be able to produce prototypes but have limited experience with production quantities. Before selecting a supplier, discuss your expected volumes. For example, ask: Can you support our prototype, pilot production, and long-term production requirements? It is also useful to ask how the manufacturer handles changes in demand, component shortages, cell availability, and product revisions. Emerging Power describes a development process that moves from technical review and preliminary design to development, first articles, customer approval, and production. Having one manufacturer involved across these stages can make the transition from prototype to production easier.

Why Working With an Experienced Partner Matters

Custom battery pack design touches electrical engineering, mechanical design, manufacturing, and regulatory compliance all at once. OEMs that partner with an experienced custom battery pack manufacturer benefit from:

Fewer design revisions and delays
Faster path to certification
Reduced risk of field failures
A single point of accountability across the entire process

Custom Battery Pack vs. Standard Battery Pack

A standard battery may be a good choice when your product can use an existing size, voltage, capacity, and connector. A custom battery makes more sense when the product has requirements that standard batteries cannot meet. For example, customization may be useful when you need a battery that:

Fits a specific enclosure
Provides a specific voltage or capacity
Handles a particular current load
Uses a specific connector
Works in a defined temperature range
Includes a BMS
Communicates with the host product
Meets application-specific testing requirements

The decision should be based on the product requirements rather than the assumption that a custom battery is always better.

Frequently Asked Questions

What is a custom battery pack manufacturer?

A custom battery pack manufacturer designs and produces battery packs for a specific product or application. The work can include cell selection, electrical and mechanical design, BMS integration, prototyping, testing, compliance support, and production.

How do I choose a custom battery pack manufacturer?

Look for a manufacturer with relevant engineering experience, reliable cell sourcing, BMS capabilities, testing procedures, quality controls, regulatory knowledge, and the ability to support both prototypes and production.

What information is needed for a custom battery pack?

Manufacturers generally need the required voltage, capacity, current, runtime, dimensions, weight, connectors, operating temperature, charging method, environmental conditions, production quantity, and applicable compliance requirements.

Does every custom battery pack need a BMS?

No. The need for a BMS depends on the battery chemistry, configuration, and application. Many rechargeable lithium battery systems require battery management and protection functions, but the specific design must be determined from the product requirements.

What battery chemistry should I choose?

There is no universal answer. Lithium-ion, lithium-polymer, lithium iron phosphate, lithium primary, NiMH, and other chemistries have different characteristics. The right choice depends on energy, power, temperature, cycle life, size, weight, safety, and cost requirements.

What certifications does a custom battery pack need?

The requirements depend on the battery and the finished product. Applicable standards may include UL, IEC, transportation testing such as UN 38.3, or other industry-specific requirements. Your manufacturer should identify the requirements for your application.

Can a battery manufacturer make prototypes and production quantities?

Many OEM battery manufacturers support both stages. Before choosing one, confirm that the manufacturer has the engineering, production capacity, testing, and supply-chain resources needed for your expected volume.

Final Thoughts

Before choosing a custom battery pack manufacturer, make sure the company can provide:

Battery engineering
Appropriate cell selection
BMS and protection design
Mechanical and electrical design
Prototype development
Battery testing
Regulatory support
Production quality controls
Component traceability
Production capacity
Supply-chain support
Long-term engineering support

The right manufacturer should be able to explain how it will take your battery requirements from the initial design through testing and production.

Talk to Emerging Power About Your Battery Project

If you need a custom battery pack for an OEM product, Emerging Power can review your requirements and discuss the available design and manufacturing options. Phone: (201) 441-3590 Email: sales@emergingpower.com Emerging Power 200 Holt Street Hackensack, NJ 07601 You can also review the company’s current custom battery design services and submit a request for a quote.

How to Choose the Right Custom Battery Pack Manufacturer

For an OEM, the right manufacturer should do more than assemble cells. The manufacturer should be able to understand the product requirements, select suitable cells, design the electrical and mechanical parts of the pack, develop the battery management system when needed, test the design, and support production.

This is especially important when the battery will be used in medical equipment, industrial products, communications equipment, military systems, tracking devices, or other products with specific operating requirements.

Recent developments in battery safety and manufacturing also make it important to consider testing, transportation requirements, cell sourcing, and regulatory requirements early in the design process.

What Does a Custom Battery Pack Manufacturer Do?

A custom battery pack manufacturer designs a battery around the requirements of a specific product.

A custom battery may need a specific voltage, capacity, current output, physical size, connector, charging system, communication interface, or operating temperature range.

The manufacturer may also design the battery management system (BMS), protection circuit, printed circuit board (PCB), enclosure, wiring, and other components.

The process usually starts with the OEM’s requirements. The manufacturer then develops a preliminary design, builds prototypes, performs testing, makes design changes when needed, and moves the approved design into production.

Emerging Power describes a similar process for its custom battery projects, beginning with an initial technical review and preliminary design and continuing through development, first-article production, customer testing, and production approval.

Why Is Choosing the Right Battery Manufacturer Important?

The battery is part of the product’s overall system. A problem with the battery can affect the performance or reliability of the finished product.

For example, the battery needs to provide enough current during normal operation and during short periods of high demand. It also needs to operate within the temperature and environmental conditions expected for the product.

The physical design matters as well. A battery that is electrically suitable may not fit the available space or may not provide the required connector or mounting arrangement.

This is why OEMs should evaluate the manufacturer’s engineering capabilities, testing process, quality controls, supply chain, and production capacity, rather than comparing suppliers on battery price alone.

7 Factors to Consider When Choosing a Custom Battery Pack Manufacturer

1. Look at the Manufacturer's Engineering Capabilities

The first question to ask is simple:

Can the manufacturer design a battery around our product?

A capable custom battery manufacturer should be able to review requirements such as:

Voltage
Capacity
Peak and continuous current
Runtime
Charge requirements
Operating temperature
Physical dimensions
Weight
Connector requirements
Environmental conditions
Expected production quantity
Applicable safety and transportation requirements

The manufacturer should also be able to explain why a particular cell, chemistry, pack configuration, or BMS design is appropriate.

Emerging Power currently states that its engineering capabilities include mechanical design, electrical design, protection circuits, fuel gauges, charger-control PCB assemblies, and battery management systems.

Ask Where the Cells Come From

The quality and availability of the cells are important parts of a battery pack project.

Ask the manufacturer:

Which cell suppliers do you use?
How are cells qualified?
How are incoming cells inspected?
Can battery components be traced to production lots?
What happens if a cell becomes unavailable?
Can you recommend an alternative cell without redesigning the entire product?

A good manufacturer should be able to discuss cell sourcing openly.

Emerging Power states that it maintains relationships with major cell manufacturers, including Panasonic, Samsung, Moli Energy, LG, and Sony. It also lists support for lithium-ion, lithium-polymer, lithium iron phosphate, lithium primary, NiMH, and other battery chemistries. The right chemistry depends on the product. There is no single battery chemistry that is best for every application.

3. Check the BMS and Protection Design

For many rechargeable battery applications, the battery management system is an important part of the pack.

A BMS can monitor battery conditions such as voltage, current, and temperature. Depending on the design, it can also manage cell balancing and provide protection against conditions such as overcharge, over-discharge, overcurrent, and short circuits.

The exact BMS requirements depend on the chemistry, cell configuration, application, and product design.

When evaluating a manufacturer, ask whether it can design or integrate the BMS instead of requiring the OEM to source the battery electronics separately.

Emerging Power says its custom battery design services can include BMS, charging circuits, automated testing, and custom software for end-of-line functional testing.

4. Ask About Testing and Safety

Testing should be part of the development process, not something considered after production begins.

The appropriate tests depend on the battery and its end application. They may include electrical, mechanical, environmental, temperature, charging, discharge, protection, and production tests.

UL Solutions currently lists battery safety standards and testing services including UL 1642, UL 2054, UL 2056, UL 2271, and UL/IEC 62133-1 and 62133-2. The applicable standard depends on the particular battery and product.

UL Solutions also notes that battery requirements can vary depending on the finished product and battery construction. For example, UL 1642 generally applies to lithium cells and batteries, while other standards may apply to rechargeable battery packs.

This is why a battery manufacturer should be able to identify the standards that apply to your specific product rather than simply saying that a battery is “certified.”

5. Consider Transportation Requirements Early

Transportation requirements should also be discussed during battery development.

Lithium batteries are regulated for transportation, and the requirements can affect product testing, packaging, documentation, and shipping.

Emerging Power published a June 2026 guide explaining UN 38.3 testing and why transportation compliance should be considered by OEM manufacturers during battery development.UL Solutions also notes that lithium-ion and lithium-metal batteries are regulated as dangerous goods under applicable transportation requirements.

If your products will be shipped within the United States or internationally, ask the manufacturer what transportation testing and documentation will be required.

6. Check Quality Systems and Manufacturing Controls

A battery design can be good on paper and still have problems if production controls are weak.

Ask potential manufacturers about:

Quality certifications
Production inspection
Cell and component traceability
Automated testing
Engineering change control
First-article inspection
Production documentation
Defect handling
Supplier qualification

7. Make Sure the Manufacturer Can Scale With You

A manufacturer may be able to produce prototypes but have limited experience with production quantities.

Before selecting a supplier, discuss your expected volumes.

For example, ask:

Can you support our prototype, pilot production, and long-term production requirements?

It is also useful to ask how the manufacturer handles changes in demand, component shortages, cell availability, and product revisions.

Emerging Power describes a development process that moves from technical review and preliminary design to development, first articles, customer approval, and production.

Having one manufacturer involved across these stages can make the transition from prototype to production easier.

Why Working With an Experienced Partner Matters

Fewer design revisions and delays
Faster path to certification
Reduced risk of field failures
A single point of accountability across the entire process

Custom Battery Pack vs. Standard Battery Pack

A standard battery may be a good choice when your product can use an existing size, voltage, capacity, and connector.

A custom battery makes more sense when the product has requirements that standard batteries cannot meet.

For example, customization may be useful when you need a battery that:

Fits a specific enclosure
Provides a specific voltage or capacity
Handles a particular current load
Uses a specific connector
Works in a defined temperature range
Includes a BMS
Communicates with the host product
Meets application-specific testing requirements

The decision should be based on the product requirements rather than the assumption that a custom battery is always better.

Frequently Asked Questions

What is a custom battery pack manufacturer?

How do I choose a custom battery pack manufacturer?

What information is needed for a custom battery pack?

Does every custom battery pack need a BMS?

What battery chemistry should I choose?

What certifications does a custom battery pack need?

Can a battery manufacturer make prototypes and production quantities?

Final Thoughts

Before choosing a custom battery pack manufacturer, make sure the company can provide:

Battery engineering
Appropriate cell selection
BMS and protection design
Mechanical and electrical design
Prototype development
Battery testing
Regulatory support
Production quality controls
Component traceability
Production capacity
Supply-chain support
Long-term engineering support

The right manufacturer should be able to explain how it will take your battery requirements from the initial design through testing and production.

Talk to Emerging Power About Your Battery Project

If you need a custom battery pack for an OEM product, Emerging Power can review your requirements and discuss the available design and manufacturing options.

Phone: (201) 441-3590
Email: sales@emergingpower.com

Emerging Power
200 Holt Street
Hackensack, NJ 07601

You can also review the company’s current custom battery design services and submit a request for a quote.

Evaluation Area	What to Verify
Cell sourcing	Cell manufacturer, approved sourcing channels, lot traceability
Engineering	Electrical, mechanical, BMS, charger and integration capabilities
Quality	Quality system, incoming inspection, production controls, final testing
Compliance	Applicable UN 38.3 documentation and product-specific certification support
Manufacturing	Facility capabilities, production controls and scalability
Supply chain	Lead times, component availability and continuity planning
Change control	Process for component, cell and design changes
Support	Engineering access and post-production technical support

High-Performance Batteries Explained: Energy Density vs. Power Density

What Is a High-Performance Battery?

What Is Battery Energy Density?

Why Does High Energy Density Matter?

What Is Battery Power Density?

Why Does High Power Density Matter?

Energy Density vs. Power Density: What Is the Difference?

High Energy Battery vs. High Power Battery

Can a Battery Have Both High Energy and High Power Density?

Why Cell-Level Specifications Are Not Enough

How Battery Management Affects High Performance Applications

Temperature Matters Too

How Should OEMs Choose Between Energy and Power?

Energy Density and Power Density Are Only Part of Battery Performance

Frequently Asked Questions

What is energy density in a battery?

What is power density in a battery?

Is higher energy density always better?

What is the difference between energy density and battery capacity?

Does higher power density mean longer battery life?

Which battery chemistry is best for high performance applications?

Build the Battery Around the Application

Lithium Polymer Battery Manufacturers: How to Evaluate Quality

What Is a Lithium Polymer Battery?

Why Does Lithium Polymer Battery Manufacturer Quality Matter?

1. Start With Cell Quality and Sourcing

2. Evaluate the Manufacturer’s Engineering Capabilities

3. Review the Protection Circuit and BMS Design

4. Examine Quality Management Systems

5. Ask Exactly How Battery Packs Are Tested

6. Understand Safety and Regulatory Requirements Early

7. Check Traceability

8. Evaluate Prototype and First-Article Procedures

9. Determine Whether the Manufacturer Can Maintain Consistency at Scale

10. Look Beyond Unit Price

Lithium Polymer Battery Manufacturer Evaluation Checklist

Frequently Asked Questions

How do I evaluate a lithium polymer battery manufacturer?

What should I ask a LiPo battery manufacturer?

Does every lithium polymer battery need a BMS?

Is UN 38.3 required for lithium polymer batteries?

Are lithium polymer batteries suitable for custom battery packs?

Final Thoughts

Discuss Your Lithium Polymer Battery Requirements With Emerging Power

Top 5 Questions to Ask Li-Ion Battery Suppliers Before Signing a Contract

Quick Answer: What Should You Ask a Li-Ion Battery Supplier?

1. Where Do You Source Your Lithium-Ion Cells, and Are They Traceable?

Why This Question Matters

2. What Quality Controls and Testing Do You Perform?

Look Beyond the Certificate

3. Which Safety, Regulatory, and Transportation Requirements Will Our Battery Need to Meet?

Why UN 38.3 Documentation Deserves Attention

4. Can You Engineer and Customize the Battery Pack for Our Application?

Ask About the Prototype-to-Production Process

5. How Will You Protect Our Production Schedule and Long-Term Supply?

Do Not Evaluate Lead Time in Isolation

Li-Ion Battery Supplier Evaluation Checklist

Red Flags to Watch for When Comparing Li-Ion Battery Suppliers

Supplier vs. Manufacturer: Know Who You Are Contracting With

Frequently Asked Questions

What should I look for in a Li-ion battery supplier?

What certifications should a lithium-ion battery supplier have?

What is UN 38.3 testing for lithium batteries?

Should I ask my battery supplier for a UN 38.3 test summary?

Should I choose the lowest-priced Li-ion battery supplier?

When should an OEM involve a battery supplier in product development?

Final Thoughts

Looking for a Li-Ion Battery Partner for Your Next OEM Project?

3D Modeling for 3D Printing in Battery Development

What Is 3D Modeling for 3D Printing?

Why Is 3D Modeling Important in Battery Development?

How Does 3D Modeling Speed Up Battery Development?

1. It Brings Mechanical Design Into the Process Earlier

2. Engineers Can Move From CAD to a Physical Prototype Faster

3. Physical Fit Can Be Checked Before Production

4. Complex Battery Enclosures Can Be Evaluated More Efficiently

5. Design Changes Can Be Tested Before Tooling

6. 3D Models Improve Communication Between Engineering Teams

From 3D Model to Battery Prototype: A Typical Development Process

Step 1: Define the Battery Requirements