I am not sure if the charger/converter on my 2015 Windsport is one that drops the charge rate to a maintenance level, but I suspect that since I had to add water every once in a while, it charged at too high a rate for long term storage. I have replaced both coach batteries with maintenance free, AGM, deep cycle batteries, so when being stored, I disconnect the batteries from the coach with a switch and attach a battery maintainer specifically designed for AGM batteries. I just changed the engine battery to a maintenance free lead acid battery and use a .750 mA Battery Tender to keep that battery maintained.
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