I don't buy this one bit. Uric acid/urea is merely an acid, much like the sulphuric acid in a standard lead acid car battery. He is using urine as the electrolyte, but by itself it has no energy storage abilities. this story is bunk.
I'd still advise against peeing on electric fences, though. For some reason, that's a "Right of Passage" in my husband's farming family.
How the next generations managed to reproduce is still a mystery...
The Toyota Pee-us?
ping
Maybe the fuel ability depends on what I drank beforehand. Beer maybe. Coffee. But water?
During the revolutionary war, Patriots saved horse urine soaked hay.
Recoverable nitrites were necessary to make gun powder.