We have 2020 Montana 3121RL which we purchased new in December of 2020 and have put a lot of miles on since we purchased. Just recently replaced both batteries with the same type that came with the unit. Prior to replacing we could park the camper for months with the power turned off and when we would pick it up we would turn the power back on and the slides plus some lights would work, however since the installation of the new batteries this is NOT the case. Batteries drain down to nothing in a week and nothing will work until plugged in the truck. Any ideas???
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