Urine-Powered Battery

(Singapore) A team of researchers led by Dr. Ki Bang Lee at the Institute of Bioengineering and Nanotechnology in Singapore has developed a urine-powered battery. The battery is comprised of a layer of paper steeped in copper chloride sandwiched between strips of magnesium and copper. According to Dr. Lee, 1.5 volts is generated from 0.2 milliliter of urine.

If my calculations are correct, typical robust beer drinkers would have several thousand volts at their disposal.