I would pull them, bring them into a warm basement, place them on a 2x8 and trickle charge them. They will freeze up there during your winter and even if you leave them plugged in you will most likely find dead batteries that won't hold a charge come spring. Been through it in Wyoming and Wisconsin with RV, boat, ATV, lawn mower batteries.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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