What to do, what to do.
We left in mid-May on a two month trip to the other side of the US in the Flair. I debated before leaving whether to leave the Monaco plugged in or not. The batteries, two group 4D Interstates, were new in '17. I finally decided to leave it plugged in. When we got back both batteries were cooked and battery acid was all over the inside of the battery compartment doing it's dirty work.
It is my thought that during very warm weather lead acid batteries will evaporate a considerable amount of water while being charged. I'm not certain if that is what happened in this case, or if a cell failed accelerating the whole process, but I will have to replace both batteries. It would be good to check the batteries occasionally when left on a charger for any length of time. I usually do this, but I was too far away.
1994 30' Monaco Dynasty, 5.9 230 HP Cummins, MD 3060, 1992 Geo Tracker.
1996 Dodge Cummins 2500 with 1996 Lance 945 camper