If this helps.
I installed an onboard battery charger that I always use at the dock (the batt switch is always off at dock too).
For the winter, the switch is off and I plug into my outside garage outlet and trickle charge all winter. Its auto-charge and drops to like 0.5A once charged.
This way I just leave them connected, check the fluid in the spring and I'm good to go. Never sorry about freezing either.
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