What is the newest source of battery power for cellphones?

Answer: urine

by News Staff / July 29, 2013 0
I. A. Ieropoulos et al., Phys. Chem. Chem. Phys. (2013)

According to scientists at the University of the West of England in Bristol, microbial fuel cells using human urine can directly power a cellphone battery -- something these researchers first demonstrated in 2011, Science reported.

As the urine cascades through a series of fuel cells, hungry bacteria consume it and release electrons, which generate an electrical current. But pee-powered conversations would have to be short -- after 24 hours of charging, a Samsung phone only stayed alive for 25 minutes.