Forget about rechargeable batteries that are plugged to a nearby electrical outlet – there are now Pee Powered batteries that are being tested in Japan. Dubbed the NoPoPo (Non-Pollution Power) Aqua Batteries, these will come in AA and AAA form factors and will be available exclusively in Japan only. You can use a variety of fluids to charge them, including your pee. Whenever the battery is recharged, it will end up with a lower power level than before. Each battery lasts up to 5 recharges at best before they’re rendered unusable. No idea on how much it costs though, but you can be sure these are environmentally friendly since they do not contain mercury or other harmful materials.
Source: Weird Asian News