I would go along with Roy's Progressive... charge controller specs, but I would start the process on a day where you can keep an eye on the recharging. Every few hours checking the battery to see if they are hot, check the charging voltage levels and check the water levels in all the cells (Wear safety glasses). After about 8 hours, disconnect the shore power, let the batteries sit for about an hour and then take a voltage reading across each battery. They should be close, within a couple of tenths of a volt within each other. If not you may have a battery that is not going to survive. If they are both within the limits of the mfr, and are not hot, they should be ok and continue charging them. Just keep checking them, and the water levels, as charging batteries will need to have water added.
Just my thoughts,
Don
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