Your battery can have all the volts in the world, but if there's no amperage (flow) it's kinda useless. I agree with Chris as well. Check out your cables and see if there's any corrosion (sulfur) that looks like it's penetrated the inside of the cable. Sulfur tends to crawl up positive battery cables and increase resistance quite a bit.
Did Autozone load test the battery? A battery can appear to be ok from the voltage but a load test can detect a slow charging battery that may completely die soon.
Good luck, sorry to hear your misfortune.
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