Great Moments in Alternative Energy

Why did they think of this?

Researchers in Singapore have developed a paper battery that is powered by urine. Despite sounding gloriously silly, the breakthrough promises a cheap and disposable power source for home health tests for things like diabetes.

The battery is composed of paper, soaked in copper chloride, sandwiched between layers of magnesium and copper. The whole thing, once laminated in plastic, is just a millimetre thick, and 6cm by 3cm in size.

The researchers report that with just 0.2 millilitres of urine the battery will provide around 1.5 volts, with a maximum power output of 1.5 milli-Watts. The performance varies according to the geometry of the battery, and the materials used