All RVs have been plugged in without engaging battery disconnect for winter. That duration was also the only time our fridge got turned off and a cover wrangled over it.
My simple take on a charging unit's fit for battery storage is by how much water it boils out of the batteries, just a little bit in 3-4 months I call it good. The Axis batteries being near plate top low, when I first checked them after bringing the Axis home, was a warning sign to me and got me considering battery storage options! Since then (about Feb) it has always been plugged in when not camping and both times I went to add/check water, they were good. Little bit of water translated to a multi cell filler setup (autofill), the bulb firms up within just a few squeezes (all good).
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Axis 24.2 "was" tug'n a JK
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