Re: Battery question ...
It really is neither normal nor abnormal for the coach batteries to drain as nearly all RVs have what we call, phantom loads that do not turn off when you turn other things off. Most thermostats don't take nearly enough current to drain a battery, but when added to things like propane detectors, radio memory, and all of the many other things, it is pretty typical of most RVs. For that reason, most RVs also have a battery cutoff that will open circuit the battery. Even the chassis battery will eventually run discharge if not monitored.
Before you put a charger on those batteries, be sure that you check the electrolyte levels because they are probably low and recharging with them that way will cause at least some damage to the batteries. Once they have been properly charged, leave the negative cable off of the post or the battery isolator open if you have one. When stored for months, it is always a good idea to make sure that the battery is charged and in an open circuit.
