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Calling all Battery and Electrical Experts.....

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JDEM
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Joined: 18 Mar 2016
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PostPosted: Tue Jun 11, 2019 2:24 pm    Post subject: Re: Calling all Battery and Electrical Experts..... Reply to specific post Reply with quote

On this subject, any lead-acid battery loses capacity as it gets colder. This is not a "discharge." Just a matter of how the electric-
chemistry works at different temps. So if your room temp is 70 degrees F and floor temp is 35 degrees F? If you sit the battery on the
floor and it gets cooler, it loses capacity. Warm it up and it goes right back where it ought to. As I recall, a typical FLA (conventional
flooded lead-acid battery) loses 50% capacity at 10-20 degrees below zero F(as compared to 70 degrees F). This is why cars, trucks, and
tractors come equipped with at least twice the battery they need to start well in warm temps.
 
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Russ from MN
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Joined: 11 Feb 2006
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Location: N MN

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PostPosted: Wed Jun 12, 2019 3:43 am    Post subject: Re: Calling all Battery and Electrical Experts..... Reply to specific post Reply with quote

I agree, the battery looses capacity as it get's colder, but it discharges slower because the chemical action slows down, I was told this by a person educated on the subject many years ago. That's why I never bring batteries in to a warm building for winter storage, if they're any good they won't freeze, and if they're no good it doesn't matter!
 
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Ken Macfarlane
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PostPosted: Wed Jun 12, 2019 4:59 am    Post subject: Re: Calling all Battery and Electrical Experts..... Reply to specific post Reply with quote

As noted, the battery won't discharge on the floor but here a better reason to stick something under the battery. Often there is acid boiled over from over charging, or filling etc that has
run down onto the case and dried. When you set that battery on a damp concrete floor, the acid will etch the floor leaving a white pattern.

Have a nice pattern of white squares inside the door of my shop to remind me of this every time I enter it.
 
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John T
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PostPosted: Fri Jun 14, 2019 4:00 am    Post subject: Re: Calling all Battery and Electrical Experts..... Reply to specific post Reply with quote

Good point, despite the facts as noted below regarding modern batteries, I usually have a piece of 2 x 10 handy to lay down first if I have to sit a battery on the garage concrete floor. Usually I place them on a wooden shelf as I don't like things (battery or otherwise) other then necessary laying on my garage floor.

Best wishes

John T
 
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