Military unit devices have similar, yet slightly more stringent requirements compared with medical devices. Capacity and safety remain at the forefront of the needs. Given the greater fraction of battery size compared to the device size, cycle life and affordability start to play more important roles. Heating/cooling, heavy mechanical lifting, and to a lesser extent, lighting, require batteries that represent a large fraction of the device's weight and size, and therefore cost. Extending lifetime and reducing cost have a greater impact with these kinds of applications.