May e other factors but similar to what we experienced. Batteries started to require a lot of water then they wouldn't maintain a charge. If I had checked them with a hydrometer I'm sure I would have replaced them sooner. Boiled them dry trying to maintain a charge on the road..
Replace them.
I killed them by equalizing or desulfating them I think. Swelled the cases and boiled them dry. No manual with the load management system.
The new ones required several hours, on the road, from the generator to bring them all up to spec. Since then they have not used a teaspoon full of water. It's been a year. They are checked every two weeks, in storage. We haven't used it much and then on shore power mostly.
T105s