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Charge Battery is a collaboration by South Korean designers Hwang Yeon Gyeong, Kang Myeong Ho, Choe Jeong Ju and Jin Jun Ho. It stores electrical energy from the mechanical energy you apply to it through the winding of a spring by twisting it`s casing. It`s similar to a child`s wind-up car in that the mechanical energy from the winding stores potential energy in a spring in the lower section of the battery, but then rather than drive the wheels of a car, the spring drives the shaft in a generator to charge a small rechargeable Ni-mH battery in the upper section. It doesn`t appear to be commercially produced yet and there is little information about the battery life but it`s certainly an exciting concept and an award winning design. I think this idea, solar powered and wireless battery power are all in the direction of the future.
Image Source: http://quintessentialcool.com/home/wind-up-double-a-battery/