Been there and done all of that. Now, when in storage, the battery cables (yes, both) are disconnected using quick disconnects. A week or so before a trip, I plug into external power from a 15 amp outlet near where I park it. Battery connected and has time to charge as well as cooling the refer getting ready to load it for the trip. Once or twice a year, clean all the cable/battery connections and no more low battery problems.
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