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Old 10-05-2014, 05:07 PM   #11
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Originally Posted by techntrek View Post
Lead acid batteries self-discharge up to 1% per day; age is a factor, too. They will also begin to sulphate once they get below 95% which is why you don't want to go more than a month - even that is pushing it for an old battery in warm temps.

90 days is way too long, that will quickly kill a battery, with the only exception when it is 20 degrees outside. Then you can go 2-3 months.
Here is documentation for my assertion proven with a 6 year old battery in storage in a shed in Maine...yes...for the winter but also for spring and summer with shed temperatures getting over 100 degrees.
90 days is perfectly safe except perhaps in the desert.

Really, It Was Not My Fault........... photo - Compass Marine How To photos at pbase.com

If you wish to read the entire test description you need to go to Marine How To - Compass Marine - Boat Repair Free Information and click on "how to articles" and scroll way down to the "Effect of winter on batteries" article for the detailed measurements and set up.

I also note that Trojan's white paper on the subject shows 60% of capacity left after 12 weeks at 75 degrees...so unless it is REALLY hot, 12 weeks is no problem. http://www.trojanbattery.com/pdf/WP_...orage_0512.pdf

I'll drop this now and people can make up their own minds about what is safe for them.
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Old 10-05-2014, 05:14 PM   #12
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Originally Posted by Golfnbike13 View Post
Thanks everyone. If I'm plugged in to shore power at home do I even need the battery hooked up?
I don't have a battery disconnect, are they worth it?
Yes they are
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Old 10-05-2014, 08:53 PM   #13
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Here is documentation for my assertion proven with a 6 year old battery in storage in a shed in Maine...yes...for the winter but also for spring and summer with shed temperatures getting over 100 degrees.
90 days is perfectly safe except perhaps in the desert.
Yes, I've been to Maine and it isn't the desert. It stays much cooler through the summer months and much colder in the winter months - all excellent temps for protecting lead acid batteries, as I stated in my last post. Just one example of the average temps at Ogunquit: Average Weather for Ogunquit, ME - Temperature and Precipitation

If the battery in that link is supposed to still be used, it never should have been tested down to 10.5 volts (0% SOC), which has done permanent damage.

You must recharge overnight every 30 days, unless it is mid-winter... or you live in Maine.
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