If you do not leave the unit plugged in to charge, this will happen. To much battery drain even with the disconnect open.
Either keep the battery on a float charger or remove the ground cable from the battery to remove all load. The battery will keep for months like this.
Charge the battery fully before you store it with the ground removed.
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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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