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Leaving the switch in "use" isn't what drains the water from the batteries, the constant charge/discharge does, a monthly check of the water levels should be done topping them off with distilled water. If you don't want to do this monthly task replace the batteries with AGM batteries, no maintenance required, for about twice the money or lithiums for 10+ times the money.
Also if the replacement batteries have CCA, CA or MCA followed by a number on top they are starting batteries typically used in vehicles & not the best option for rv house batteries, you need true deep cycle batteries with aH (amp hours) listed on the tops or some choose 6 volt golf cart batteries wired in series.
There's also a Lippert update out there somewhere that recommends changing that 50amp circuit breaker for the level up system to an 80amp.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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