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Joined: Sun Nov 19th, 2017
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Dang, 3 or 4 years is crazy, our somewhat temperate climate gets nearly ten here!
Depends on the cars and how they are driven.
I drive a lot of turbo cars, and they dump a lot of heat under the hood... cooks batteries. My wife does a lot of short drives, and some weeks her car gets used only once or twice a week, so a lot of cold starts, without a lot of driving charge time. (one or two miles to the store, and then back again.)
pack that into 4+ months of over 100 degrees and often 1-2 months over 110, yeah, batteries don't last long.
My sister had a saturn with a battery in the trunk, and it lasted from the time she bought it new, till the car was side swiped by a drunk driver totaling it, which was over 8 years. battery probably could have lasted a lot longer if the car hand't have been totaled.
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1998 Mazda B4000
Mesa, AZ