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Old 10-16-2012, 10:16 PM   #11
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Join Date: Jul 2012
Location: Canada
Posts: 120
Originally Posted by VinceU View Post
Not a "cold forum member" but handy with WWW. Batteries when charged freeze at -77F. If 75% charged freeze at -37. Recommend do not use $20 trickle charger, will fry battery over long term. Use voltmeter or hydrometer method of checking. Charge when falls to 80% back to full. Full time charging as bad as no charging. Healthy cold battery will last up to a month before dropping much. Check out " car and Deep cyle batteries FAQ."

Hadn't realized there was a car and Deep cyle batteries FAQ. Shall check it out!

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Old 10-16-2012, 10:29 PM   #12
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Join Date: Jun 2010
Location: Southern Alberta
Posts: 459
It gets minus 40 and worse here for a week or more at a time. We use a battery minder on the vehicles not used regularly. I don't have heating pads (see previous posts for a picture) but I do have an oil heater on the engine.

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Old 10-16-2012, 10:31 PM   #13
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Join Date: Aug 2012
Location: MN
Posts: 608
Ditto on Acadianbob - use a smart charger. Sounds like your intelligent charger is ok. At freezing temps, you are not going to overheat your battery. Those wrap blankets just warm things up, they don't get hot. Smart charger choices and technical info at Technical Info -

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