Lithium polymer batteries differ from lithium-ion batteries only in construction. The difference in construction over conventional Li-ion cells allows for lower cost, safer operation, and flexible packaging options. The size of lithium polymer cells is a major factor and what makes custom lithium polymer battery packs and battery assemblies the battery of choice for many applications. Wearable products, medical monitors, IoT devices, handheld, and new product designs that require very low profile cells and lower cost batteries.