Battery(ies) need to be disconnected, and, if the weather is going to be very cold, removed and stored indoors for RV long term storage or winterization, for sure. Keep them on a "trickle charger" if you can.
The propane leak detector, carbon monoxide detector and/or any other "things" which operate off the RV battery will certainly pull it down after a few weeks/months, esp. if the outside temps are very low.
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