a friend of mine at the marina just gifted me three huge agm batteries.

submitted by ababydog from self.whatever

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[–]Zapped 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

I'm not sure if the spotlight would be enough for a proper test. You can charge them and take them to an auto parts store and they will load test it for free, or you can but a load tester and do it yourself. They run form $50-$100 but you can find them at Harbor Freight for around $20.

[–]aqop 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

i just put a digital voltmeter on it and i know how a "bad" battery behaves... and i know how a fresh battery behaves.. if the battery is bad and i put a heavy load on it and it drops low maybe below 12 volts, it aint good.