First check the water level in the batteries, see if they evaporated dry.
Top off with distilled water.
2006 Fleetwood Bounder 35E Trek pure Trike, electric, 50 mile range, 4700 miles the get everything runner. To be toad list Done, Ford E450 toad. Stay & Play active brakes.
Full-time since 2018. LG 4.5 cu ft washer/dryer.