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How winterize battery

Have a regular 12v battery, what do I need to do (if anything) to winterize.

I'm storing it in our basement, which does get cold in MA winters.

Have a small solar panel I used during the season to keep it topped off.

Thanks in advance for advice.

sw
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Re: How winterize battery

Here's what I do:

- Check electrolyte levels and top off with distilled water if necessary.
- Make sure the batteries are fully charged
- Disconnect the batteries, clean/dry top of battery and connections

FYI - I keep mine onboard during winter storage.
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Re: How winterize battery

Thank you kwaltersmi!
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Re: How winterize battery

We do the same as Kwalltersmi but we bring them home and attach to a charger in the garage. Over the winter we rotate which battery is attached. With larger boats and larger battery banks that becomes a pain if it's even possible, but for now we can easily remove the batteries.
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Re: How winterize battery

Thank you, DRFerron
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Re: How winterize battery

For years, I took mine out and charged in the basement. Last year, I left them onboard. We get pretty cold here in Wisconsin. They hardly lost any charge at all.
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Re: How winterize battery

I have two battery banks on board. The house bank is two group 27 Gels, The propulsion bank is four 8A4D batteries in series making it a 48 volt bank. They have been on board since they were installed seven years ago. They remain connected through the winter. Both have solar panels connected through Morningstar controllers keeping them topped up. The 48 volt bank also has a 48 volt wind turbine connected to the bank. For the most part the solar panels keep things topped up in both cases. But, I do check on the boat at least once a month (often more if the weather is nice) and power up the 120 volt battery chargers when on board. Not that is really needed. Seven years and both banks are still going strong.
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Re: How winterize battery

Good to know mbianka!

Thank you
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Re: How winterize battery

I leave mine on board but charge them about the first of the year. If am always concerned that if they get too run down, the acid concentration will be low enough that they might freeze and crack.
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Re: How winterize battery

I fully charge them and even equalize for a few hours, disconnect them, and leave them on the boat. This spring when I hooked them back up they were still at 12.5V.
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