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Re: BatteryBeak: Utility of making internal resistance and state of charge measuremen
Quick pic of poor man's battery discharge tester.
Battery voltage is on the left. Battery amps on the right*. Meters can be had for less than $5 each at Harbor Freight.
Sealed beam headlight is from my 68 Camaro, I think. Found it in a pile of old auto parts. Not quite 36 watts.
Battery is from my lawn tractor.
For actual use, the wiring should be cleaned up, and the headlight secured safely on a fireproof surface.
sealed beam for safety (do not use a replaceable bulb). no cracks or chips or signs of damage. competent adult supervision required. always use safety glasses.
*The ammeter is just to confirm the lamp's wattage. You don't need the ammeter for the test if you know the wattage.
Last edited by Ether : 15-08-2013 at 20:35.
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