Quote:
Originally Posted by theastronaut
Make sure the top of the battery is clean, you can get a drain if there is current flowing between the post from buildup of gunk.
Notice where the positive lead is touching...
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YUP! When I worked as a mechanic and people came in with dead batteries, I'd put the voltmeter on them like that, but the battery was filthy dirty, and damp. I'd show them the voltmeter reading and then clean the battery top. If the battery was actually bad, I had a sale. If it wasn't, they would trust me later for a sale.