new batteries leaking during off-season storage

the batteries are only a year old. they were delivered with the RV. Really, the batteries aren't used that much. Mainly just to run the leveling system during setup and tear down.

The batteries are about as cheap as the come. Just enough to qualify as a "battery" I suppose. I would imagine that most RV companies do something similar to maximize their profits. I would imagine a battery replacement sometime mid summer to 6 volt batteries.