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I have the same boat in the same area. I have been leaving mine in for the last couple seasons. Outside, shrink wrapped, I let the charger top them off, disconnect them and clean the tops of the batteries.
My battery sits in my car and tractor all winter long. I don't see why the boat is any different.
I (and my neighbors) have been charging the batteries and leaving them in the boat for the past several years of New England winters.
Keep in mind batteries have to come out after the boat is out of the water. That means lifting them out of the ER, moving them down a step ladder, and then to your car. From the car car to your basement, and back again.
During that time you risk:
Back injury,
spilled acid on you, your car, or your house,
dropped battery requiring replacement.
If fully charged, and disconnected, your batteries will be safe on the boat.
Henry
I have AGM batteries, I have always removed them but it is a real PITA. 4 large group 31s in and out of the bilge is a hassle. I can't disconnect the batteries because the hatch has to go down before the shrink wrap goes on. I have been thinking about leaving them in the boat this year with the charger on. I have access to AC power all winter. Is my 2005 battery charger considered good enough to leave it on all winter? Should I disconnect the mercathode so it isn't on all winter?
If you have a 12 volt jump box you can feed 12 volts into the system by via the "cigar" lighter outlet with the batteries disconnected. That will Llow you to lower and raise the hatch.
Henry
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