Clarke's idea is a good starting place. If you have lost much of the water in a cell or battery it could cause the charger to run like crazy trying to recharge it. A dead cell in one battery could also cause an extra draw on your charger. After checking the level of the water in each cell, refilling any that are low, recharge the batteries, then disconnect the batteries one at a time and measure their no low voltage. If one is significantly lower than the others, you may have a short or dead cell in that battery. Sometimes you can restore a battery if the plates have dried out but it will take patience recharging that one battery by itself for an extended time or if your charge supports equalization, that can sometimes bring back a dying battery.
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