
We use vinegar, salt, cardboard and coins.
It can power a led light with no problem.
Euro coin and UK Nickel coins pence try but it worked better with pesetas (Spanish coins).
Homemade battery energy
You can also check for more info:
Music: Jens East - __TrackName__ (ft. __featuring__)
www.soundcloud.com/jenseast
Licence: Creative Commons Attribution V4.0