I had a similar problem with my 2017 mini lite. A little after one full year the battery started going dead while parked at home, even when plugged in. The battery charged fine with a stand alone charger and the converter put out plenty of voltage with the battery disconnected, but the battery would go dead in a couple days after each charge on the stand alone charger/maintainer.
Long story short, it was a converter going bad so I replaced it with one I got on Amazon. It was really weird, because the converter appeared okay with either a fully charged battery or no battery and powered everything as it should. For me the tell tale sign was after 2 weeks of playing around with it, the voltage output of the converter started dropping down to 10 or 11 volts.
Anyway, after replacing the converter, the battery charged right up and is being maintained fine now after a couple months. I did buy a different brand then the original since the original only lasted just over a year. the one I got was a drop in replacement. If yours is bad though, it should be under warranty.
Ray
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2017 Rockwood 2109S
Ram 1500
Me Her And a furry little dog
US Navy Veteran
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