Introduction: How to Make a Battery Tester
Step 1: Materials
For this you will need:
Small light bulb (I got mine in a small science kit
2 Alligator Clips
Battery to test
Step 2: Attach Rubber Bands
Attach the rubber bands to both ends.
Step 3: Attach Alligator Clips
Attach the alligator clips. Make sure they are touching both the positive and negative sides.
Step 4: Attach Clips to Bulb
Attach clips to bulb.
Step 5: Testing
The brighter the bulb is the more juice is in the battery.