Make a Battery with Spare Change

Powering a Calculator 1

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penny battery calculator

credit: The King of Random

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Pick up a calculator from the dollar store and remove the screws on the back so you can get to the battery. Remove it, and save it for another project.

Now pull the negative and positive leads out of the casing and attach wires to the terminals if you can. I just twisted the wires to the battery leads, and used electrical tape to hold them together.