The NoPoPo (no pollution power) batteries are rechargeable via a variety of liquids, including water and urine, injected into the battery chamber with a pipette. A mixture of magnesium and carbon reacts with the liquid and produces power up to 500 mAh in the case of an AA-size battery.
The batteries come in AA and AAA and retain their charge for up to 10 years. However, they can be recharged only a limited number of times (2 to 5 times on average).
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