Make a Battery with Spare Change


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penny battery intro

credit: The King of Random

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Instructables user The King of Random gave us permission to share his cool project that teaches you how to build a battery with the spare change in your pocket. In just a few steps, a handful of pennies can power a small calculator or an LED bulb.

To complete both the calculator and LED project you'll need:

13 pennies, dated 1982 or later
sand paper
an electrolyte such as vinegar, lemon juice or salt water
zinc washers
electrical tape
a small, cheap calculator
one or two LED bulbs