Join Date: Feb 2010
Location: Narragansett Bay
Thanked 237 Times in 222 Posts
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Re: winter storage for batteries
You don't even need to leave an AGM on a charger, they self-discharge very very slowly. Go top them off about every 4 to 8 weeks. Just be sure they are fully disconnected from any draw. We have t-handles that cut them off, but many have to pull the terminal wires to know that some little parasitic load isn't still alive.
That's what I do. I have 13 AGM and/or Gel batteries aboard. No way I can take them all off.
6 years, however, is boarderline for the longevity of an AGM. If they need a full time charge or don't survive the winter, it isn't because of the cold weather.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.