I have stored my Box every winter (1 Nov. to 1 May) in a rental garage for the 3yrs I have had it. No trickle charger and no battery problems yet, but then I would take the car out for a spin at least every 3 wks. The winter weather here is fairly mild and we don't have snow and slush staying on the ground for weeks at a time.
Most of the rental garages I have looked at have no power of any kind in them.
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