an improved version moving away from fruit power to liquid acid power. Any acid will work, such as soda, water, that stuff that eats through your flesh when you spill it on you, or anything else that is acidic. brought to you by knox tech.

step 1materials & tools
to make this battery, you need: 1 plastic shot glass copper zinc knife acid
step 2Prepare the shot
use the knife to make a cut a little over the bottom of the glass, but not that low.
step 3insert the electrodes
the electrodes are the zinc and copper. Bend them so that they reach down about the length of the bottom to the cut. Then place the bent part in the hole and push up, and t…
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http://www.instructables.com/id/Make_your_own_simple_battery_2/