The answer to this depends, to some degree, on how long the battery will not be in use. I believe most RVers leave the batteries in the RV during the camping season. If you decide to leave them in the unit, then you might consider hooking them up to a battery tender (2A trickle charge type). Check the water level frequently if you leave the batteries on any charging system. Or you can use shore power and have your batteries charging via the inverter. As an alternate, from time to time plug and unplug your rig from shore power. If you do this, be sure you check the water levels frequently.
Some folks have a battery disconnect switch turned to the "OFF' position so as not to allow clocks, sensors, TV and stereo displays with their drain on the batteries.
I think the bottom line is to keep your batteries charged when not in use wherever they are located and look after them by checking water levels, SG readings and for corrosion around the terminals.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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