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Lots of the less expensive chargers put out 500ma or less. That would mean that a 12ah battery would take 24 hours to fully charge a spent battery. That time could be even longer if the battery or charger terminals are not clean and securely connected. Also, I would not trust that the output of the cheap chargers is accurate. I have had 6v 12ah batteries take 2 days to charge fully due to one or more of these problems.
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