Mine used to do that if the reversing camera was left connected , even when it was switched off it drew a lot of power, it was the old type though not the flat screen type.
Batteries are a motorhomes life blood. Nothing will work without them.
Buy a simple hydrometer and a Machinemart drop tester.
You will never have to worry if your batteries are any good again.
Over a period of time these 2 items will pay for themselves time and time again.Have had batteries showing 12.6 with a multimeter even after resting for a couple of days and when tested with a drop tester US.
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