http://www.weirdasianews.com/2007/09/09/pee-powered-batteries-on-sale-in-japan/All I can say is that these are a survival preparedness nuts wet dream. Rechargable batteries you recharge by adding pee. You can use other fluids but when you're lost in the woods with dead GPS batteries...I always know the one thing I'll never leave home without...is pee!
If only I could find some to buy and try locally.