We've always used AGM in our Monty's and haven't had a charger on them in the winter. If you disconnect the ground wire they won't drain and fully charged batteries don't freeze.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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