'''Power cell''' is a generic term used for small power sources embedded in a device, item or a augmented person.
The standard power cell is a self-contained energy storage unit acts essentially as a very powerful battery or capacitor and renew its energy continuously. They are used in almost every device or item that uses energy, from computers, bots, datacubes, thermoptic camo and also for passive mechanical-augmentation that require an energy source to operate continuously unlike the active mechanical-augmentation that uses the bioenergy of the mech-aug.
Like the passive mechanical-augmentation, passive nano-augmentation (especially nanites) also require an energy source to operate continuously unlike the active nano-augmentation that uses the bioenergy of the nano-aug. In the field of nano-augmentation, they are powered by nano-power cells, a nano canisters of nanite energy that act of a power supply and renew its energy continuously, allowing illimited use of passive nano-augmentation.