Urine powered batteries
Forget about rechargeable batteries that are plugged to a nearbyelectrical outlet - there are now Pee Powered batteries that are beingtested in Japan. Dubbed the NoPoPo (Non-Pollution Power) AquaBatteries, these will come in AA and AAA form factors and will beavailable exclusively in Japan only. You can use a variety of fluids tocharge them, including your pee. Whenever the battery is recharged, itwill end up with a lower power level than before. Each battery lasts upto 5 recharges at best before they're rendered unusable. No idea on howmuch it costs though, but you can be sure these are environmentallyfriendly since they do not contain mercury or other harmful materials.
Source: coolest-gadgets.comAdded: 11 October 2007