I stored my MH and toad for two winters in Anchorage, no power at the storage yard. I charged everything fully and disconnect the ground cable on all batteries, six 6v, 12v chassis and the toad. That was in '07 and '08, all are still going strong.
The colder it is the lower the self discharge rate.
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Most RV batteries live a long and useful life, some are murdered.
2000 National Sea Breeze F53
1998 CRV Toad
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