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

  • 1 wine cork
  • a few inches of electrical tape
  • any color LED


  • Small hand saw
  • Drill

Step 2: Re-sizing

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

Step 3: Slot

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

Step 4: LED Slot

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

Step 5: Insert the LED

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

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

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

About This Instructable




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