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How to Make a Coin Battery

Sure you could take $2.50 and just buy some batteries, but how much fun would that be?


  • Step 1: Mix cider vinegar & salt In a bowl, mix the cider vinegar and some salt.
  • Step 2: Cut out blotter paper Cut out ten quarter-sized pieces of blotter paper.
  • Step 3: Tear aluminum foil Tear off ten quarter-sized pieces of aluminum foil.
  • Step 4: Soak blotted paper Soak the blotter paper in the vinegar/salt mixture for a few minutes.
  • Step 5: Build the battery Time to build the battery. Start with a piece of foil, then a piece of blotter paper, then a quarter. Keep stacking in the same pattern: foil, paper, quarter… foil, paper, quarter… Until you’re out of quarters.
  • TIP: Make sure the foil is only making contact where it’s supposed to. If it’s touching more than one quarter, or another piece of foil, your battery may not work.
  • Step 6: Let battery charge Let the battery charge for about 15 minutes.
  • Step 7: Touch LED's leads Touch the LED’s negative lead to the bottom layer of foil, and the positive lead to the quarter on the top and presto – you have light.
  • FACT: This method of generating electricity was discovered in 1800 by Alessandro Volta. His voltaic pile was the first wet cell battery to produce a reliable steady current of electricity.

You Will Need

  • 10 quarters
  • Some cider vinegar
  • A piece of blotter paper
  • Some Aluminum foil
  • An L.E.D. light
  • A little salt
  • 2 small pieces of 16 gauge wire
  • Scissors
  • A pen

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