winter storage for batteries - SailNet Community
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post #1 of 3 Old 01-02-2013 Thread Starter
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winter storage for batteries

Hello all ,

I have 2 , AGM 4-D batteries . would winter storage be ok in the boat here in CT, if they were on a charger all winter ?

or should I pull them and bring them inside ?? there about 6 years old and in good heath ..

the weight of them is why i ask , this is the first year i havent pulled them .

Thanks for any tips
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post #2 of 3 Old 01-02-2013
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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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post #3 of 3 Old 01-02-2013
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Re: winter storage for batteries

You can leave them on the boat. Just make sure you fully charge them and then disconnect them prior to storage. AGM batteries loose about 3% charge per month so they should still be about 88% full come spring.

But as mentioned above your batteries are about at the end of their life expectancy. IMO they have exceeded it at this point, so you should be very happy with them You may want to consider replacing them anyway.
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