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A Free Do-It-Yourself Tip from DisasterGuy.com Battery Tester from a Flashlight Bulb: DIY! A piece of wire and a flashlight bulb are all you need to make a battery tester. The one shown above uses a flashlight bulb from a flashlight with one 1.5volt battery. The piece of tape on the wire says “1.5 volt.” Take the insulation off one end of a wire, bend it into a loop around a pencil, and twist it tightly. If your flashlight bulb won’t fit in, untwist the wire until it can, then re-twist. Take a little insulation off the other end of the wire so you can complete the circuit and make the bulb light. You use it by putting the wire on one end of the battery to be tested, and the bottom of the bulb on the other end of the battery. Look for the brightness of the light to get an idea of how much juice the battery has in it. We used a voltmeter to test batteries with mixed results. Yes, it would say if a battery was producing something like 1.5 volts. But we couldn’t tell if there were enough milliamps to light a flashlight bulb. This test rig works. You can also make 3-volt, 4.5-volt, 6-volt, and 12-volt battery testers using bulbs of the appropriate voltage. We soldered wires to a 12-volt turning signal lamp from an automobile to test terminals in that vehicle. One DON’T: Do not use a 1.5-volt lamp to test a 3-volt battery, or use any lamp to test for more volts than the lamp was rated for. You’ll burn out the bulb. All Tips may be copied for incidental, non-commercial, or home use. All DisasterGuy.com Tips are tested before posting. Usersubmitted Tips welcomed; byline given but no reimbursement. All website content is for educational and informational use only. Copying or downloading any part of a page or using information from this website constitutes a specific release of liability to DisasterGuy.com and its affiliates for any and all damages that may result. If you attempt to make or use any Tips or other information, use safety equipment including eye, hearing, and hand protection, etc. This page Copyright DisasterGuy, Inc. 2012