http://www.newscientist.com/article.ns?id=dn7850

Wee-powered battery smaller than a credit card

From the page: The first urine-powered paper battery has been created by physicists in Singapore. The credit-card sized unit could be a useful power source for cheap disposable healthcare test kits for diseases like diabetes, and could even be used in emergency situations to power a cellphone.

See also: MedGadget.

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