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The title says it all, I bought a 12 volt automotive battery tester, then hooked it up to everything I could find. Cars, batteries, non-batteries, non-humans, various sticks and rock. Ok maybe not all of that, but in this video we do check out what a car battery tester does. Also we take a look at various battery chargers, like the one that murdered my Polaris. I WILL HAVE MY REVENGE.