Posts: 3480
Location: Elk River, Minnesota | Hiya,
Contrary to what some may say in various circles, Leaving them in the boat in the cold is actually the best thing you can do for your batteries, given they are fully charged. In cold, an unused battery does not discharge very much at all....but...to help reduce any sort of discharge that might take place, disconnect all other items from the battery and leave only your charger hooked up.
Then, all you need to do is plug your charger in every month for about an hour or so, just to keep the batteries topped off. I would suggest NOT leaving the charger plugged in, even if automatic, because if for some reason the charger fails, you might find bad things have happened like a battery that overcharged because an automatic shut off or trickle charge didn't kick in.
Do this, and your batteries will last a long, long time...
Steve
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