More how to make a coin battery

The author did 2 different takes on the coin battery, My preference is for version 2 with does not need as much foil.  This would be a good project with the kids.  I am impressed that 6 pennies will power an LED.

http://www.instructables.com/id/build-a-coin-battery-version-two/

http://www.instructables.com/id/build-a-coin-battery/

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