HOW TO – Homemade gravity-cell batteries powers a string of LEDs

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Popular Science’s Theodore Gray show you how to power a string of LEDs using a chain of five homemade gravity-cell batteries – Link.


  • Tomato soup battery and more – art by Ben Woodeson – Link.
  • Penny-Powered LED – Link.
  • Powering LEDs costs mere pennies – Link.

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From the pages of MAKE:


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