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I did a couple of things for 2 different boats. One one boat I took the batteries out and brought them into the house. If you have the space somewhere, this is the best thing. Just make sure they are charged up and the batteries will be good to go. The basement is better than leaving them outside.
On the boat where I left the batteries in, I put them on a trickle charger, a Schumaker I got from Wal-Mart for some $27, it is a smart charger in that it will sense when the battery is low and do what is right for the battery. I put the batteries I brought in the house on the charger about once a month as well to make sure they are topped up. The charger is cheap and makes sure the battery stays good for the 2-4 months they are out of the boat/the boat is not being used this winter.
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