Urine-driven fuel cell charges smartphone from single pee

A miniature fuel cell that costs less than £2 and can generate electricity from a single visit to the toilet has recharged a smartphone for the first time.

Article: EandT

So soon when you go out hunting Pokemons and your battery is about to die on you and there is just a Pokemon you have been dying to catch - no worries it's just a pee-whee away :D