Re: always a voltage issue
How long did the cart sit? You may be able to cycle the batteries a few times and get them to come back, or run that big charger on it for another couple hours to try to desulfate the plates.
I would agree that a new smart charger would serve you better in the long run. Those maintainers really don't do any actual charging of the pack. They just keep it fresh for an extended time after a charge. I don't think your pack has ever really had a full complete charge using that method.
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