The “Non-Pollution Power” battery comes with a dropper and can be recharged using a variety of bodily fluids, including urine, blood, tears, and semen. Japanese inventors soaked a piece of paper in a solution of copper chloride and sandwiched it between strips of magnesium and copper. When a drop of urine is added to the paper through a slit in the plastic, a chemical reaction takes place that produces electricity. The battery, which so far is available only in Japan in AA and AAA sizes, loses a little bit of power each time it is recharged.”]
Source: https://www.darkreading.com/analytics/a-battery-that-runs-on-what-