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I think I would remove them and store them inside. Battery manufactures usally recommend storing above freezing. Also the orientation video mentioned that the propane detector was a drain that had no fuses or disconnects and would drain a battery in short order in storage unless disconected. I would store them in a place where it was relatively warm and put a charger on them every month or so. I do that to my boat through the winter and have had excellent results. I usually put a 1&1/2 amp charger on my boat batteries for a day or two halfway through winter. If you can't bring them inside at least remove the negative cable and charge them every month or two.
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