[Festus2]

I think it is common practice for people to leave their battery connected during the times when they are using it. Some RVers have installed a battery disconnect switch to prevent any "accidental" or intentional use of exterior switches or unnecessary drain by propane detectors, stereo lights and clocks, etc.
During the winter storage months, some folks use a trickle charger to keep the batteries from totally discharging without removing them from the RV. If you do this, you can disconnect the detectors, stereo, TV-- anything that draws a tiny current. ( Or you can yank the fuse to these). Others remove the batteries and charge them up from time to time or put a trickle charger on them.
The important thing to do is to keep them charged and topped up with water when not in use.