One battery should be enough if it's a good one and fully charged. If it's been damaged by low water levels or if it's been stored and not actually disconnected (the battery disconnect will still drain your battery) then it needs to be replaced. ATM batteries will solve the water issue, but not the battery disconnect not disconnecting everything.
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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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