I had two generator batteries, brand new but never charged and completely dead. After reading the reviews I was hopefull this charger might ressurect them, even though running the generator did not. It worked! Each battery took more than 24 hours but both of them came up to 100% charge. That was only a few days ago so I don't know how well the charges will hold, but at least I can keep the batteries up now by trickle charging them (with a different charger).
Obviously this should work as well or even better on a good battery that has just gotten run down, such as a car battery with the lights left on. Hopefully it will last, but right now I'm very pleased with the purchase. It is a bit noisy, only because it apparently has a fan that runs constantly, but that is not a problem for me as I used it in my basement. It's quite light weight, so I don't know how well made it is, but time will tell. So far, very good!
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