Quote:
I read elsewhere the fuel is butane


Butane would indicate a heat source. Kind of misleading when most folks think of "fuel cells" as "polymer electrolyte membrane fuel cells (PEMFC)"
It's still a great idea. Any "fuel" will produce more energy than human or solar.
I'm working on a "yo yo dynamo" from a scrap stepper motor which can produce as much as 15-20 watts, but still requires yanking a sting for a few minutes. They used to be for sale but never caught on. Check this out:
http://www.potenco.com/products
_________________________
paul, texas KD5IVP