Having learned the hard and expensive way too many times with my boat and old popup, One the very first things I did when I bought the motorhome was to order two disconnect switches
like this -
BS200 Top Post Battery Master Disconnect Switch
one for the house battery
and one for the chassis engine battery.
When I park it to stow even for a night if not plugged in (and not camping), I disconnect both batteries
It was my first time using this type of switch. A lot cheaper than a marine type and working fine after a year of use.
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