My BX sits for several weeks at a time in the winter with no battery problems... Of course I'm not in Maine. A trickle/maintenance charger might be in order when it's sitting.
Ian
I used to live in a place like that. Get a snow forecast and I'd be putting those cable type chains on and parking at the top the night before. Drive 5 miles to the main road that the county maintained, pull off, remove chains, drive the remaining hour and 15 to work. That winter fairly sucked. I moved the next summer.
Ian