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
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!