Introduction: Easy 3v Coin Cell Battery Tester

Picture of Easy 3v Coin Cell Battery Tester

Have a'lot of 3v Coin Cell battery's lying around and want to see which ones work? Use this super easy to make and use battery tester!

Step 1: Materials and Tools

Picture of Materials and Tools
  • 1 wine cork
  • a few inches of electrical tape
  • any color LED


  • Small hand saw
  • Drill

Step 2: Re-sizing

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Take the cork and cut it in half. There's no need to measure, just take the larger half.

Step 3: Slot

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Cut out a slot on one side to hold the battery.

Step 4: LED Slot

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Drill a hole on the other side so the LED's leads can stick through to the battery.

Step 5: Insert the LED

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Put the LED leads through the hole so a battery can go in between them and power the LED. If the leads stick out from the slot bend them around the cork.

Step 6: Wrap It

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Use the electrical tape to wrap the cork giving it a cleaner look and holding down the bent over leads.

Step 7: Testing Some Batterys

Picture of Testing Some Batterys

Put the battery in the slot and look at the brightness of the light to know the power of the battery!


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