Monday, 8 November 2010

How To Make a Salt Battery

1Clean each coin with a solution of water with a drop or two of dishwashing detergent. The coins don't have to be shiny and new looking, just make sure to remove any debris and dirt from the coins and dry them with a towel.

2Cut the paper towels into small squares, small enough to fit under the smallest coin.

3Create a solution of saltwater by mixing about t2 tablespoons of salt into a glass or bowl of water. Use a spoon to thoroughly mix in the salt and continue to stir when the salt begins to settle to the bottom of the glass.

4Place the paper towel pieces in the saltwater solution, allowing them to soak fully.

5Layer the coins and squares of paper towels. Start with a 1p, then place a piece of paper towel on top of it, followed foil, then another square of paper towel. Repeat the pattern until you use all coins, foil and paper towels. Make sure the top coin is a penny and the bottom coin is a nickel.

6Touch the exposed wire ends of either a voltmeter or a LED light, which is similar to the indicator light in many electrical items showing that the item is on and receiving power. The coin battery should get a reading of at least 1 volt on the voltmeter or make the LED light turn on to show that the coin battery is generating power.


  1. Brilliant! Saw the light clearly. Well done, Owen.

  2. Very cool! My son would love that. Good job Owen!