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I have a car battery that I am 99% sure is bad. When I took it for testing they said 'battery is good, just needs charging'.
I suspect if you charge it they will say 'battery is 100% charged, it's fine.
I think the issue is that the new pocket testers do not load the battery. You need the old fashioned style tester that had resistors, and you could dump a crap load of energy while monitoring the voltage and current.
Project Farm did a review of testers, they did seem to work, but I prefer to see the battery do some work under load.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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