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Old 10-31-2015, 07:51 AM   #41
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My car battery has a battery inspection window. That's a small round window with a green circle as good, red as bad. Convenient. The first battery I've had (or at least noticed ) that has the window.

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Old 10-31-2015, 07:51 AM   #42
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Join Date: Sep 2005
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Originally Posted by DFW_M5 View Post
I lived in CT for many years and the reason for cranking problems in the cold temps of winter are attributed to thick oil, terminal corrosion, but not the batteries cells themselves being killed by the cold. Battery life in TX is much worse in my experience due to those 100 degree summers. See:Hot Weather the True Culprit Behind Car-Battery Trouble - Be Car Care AwareBe Car Care Aware -
While the cold does not usually 'kill' the cells (going completely dead, usually due to an open circuit), a car battery cannot deliver as much power in the cold. Power drops quite a bit, and when you couple that in with the thick oil you mentioned, a battery that would start a car fine in warm weather, just can't crank it when it gets to zero F or below.

But yes, from what I understand, the heat can 'kill' the battery. May work pretty well one day, and just dead the next.

Modern cars generally start so easily now, I feel like it's harder to tell when that battery is getting marginal. A load test is a pretty good check. Back in the 'bad old days', the car cranked long enough that you could hear if it was getting slow. Now it's usually just ... Whrr-vrooom! It used to be Whrrrrrr-Whrrrrrr-Whrrrrrr-Whrrrrrr-blam-Whrrrrrr-blam-vrooom.


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Old 11-01-2015, 11:01 AM   #43
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Up here on the cold Canadian prairies, the lifespan of a battery seems to be about 5 years. I get about 4 years out of mine, but I punish it with a short 6km commute using the heated seats and rear window defrost almost daily so it rarely gets a chance to fully re-charge.

The current battery in my car is already 4-years old, so if I was smart I'd change it for a new one now instead of waiting until it doesn't start on a -35 day in January...

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