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if they charge quick and drain quick have you checked the water levels in them, get a hydrometer and check em. you might have cooked some water out of em.
you also might want to try an equalization charge but you might need shore power for that. next thought would be to take each one out of use for a day, charge it up to 100 % then put a load on it for a few hours ( like your inverter running a few light bulbs ) and check voltage. then do each other battery the same, you might have a weak one pulling the rest down
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