Wind-up Rechargeable Batteries

 Taking advantage of the kinetic energy of the user, these prototype wind-up rechargeable batteries are designed so that the user can recharge them on the go by winding the small crank built into the battery. Once charging is complete, the crank folds back into the battery for storage during use, and the batteries may also be charged at home through the use of a traditional outlet-mounted charger. Designed in both AA and AAA sizes, the wind-up batteries are designed to be a more eco-friendly solution for battery draining tech like digital cameras and GPS devices.

 Source:http://www.mydigitallife.info/wind-up-rechargeable-aa-battery-with-innovative-design/