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Your unit's converter should have multi-stage charging and would not overcharge and damage battery provided the factory converter has not been replaced with an inferior one. We full-timed for 10 years always plugged in and never a problem with our 2008, 2012, and 2018 Montanas.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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