Instructables

Step 5: Stack your battery

Picture of Stack your battery
Start with a battery zinc side up, then put a piece of paper towel, then another penny same way as the first. It should alternate like this until you use all the pennys you want. 6 is the average I've seen, but I'm gunna try 7 just to see if I can maximize power. Or kill the LED for extra fun. The picture is showing how it works as a battery.
 
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