I always remove both batteries and store them inside the basement over the winter.I check them a couple of times and throw the charger on just to bring them up to full charge if needed.It's been working fine this way,and I manage to get several years out of my batteries.
On the other hand friends of mine just leave them in the boat with a battery maintainer on them and it works good for them,even up in the cold New England winter,so who knows.
The important thing is not to let them discharge if you leave them in the boat in bitter winter climates.As mentioned they can freeze and cause the case to split.
Now, if only they could invent a battery that only weighs about 5 pounds,that would make me very happy.
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All this,just for a boat ride
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