The main problem with leaving them plugged in while in storage, out of sight, out of mind. The battery can go low on water, lose charge, freeze and be dead by spring. Just me, but I prefer to pull the $200 investments, put them in a warm location, pull the tops, top off the water, and put them on a battery tender. This process keeps me from having to spend $200 on new batteries in the spring.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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