"A battery warranty will not start your car on a winter morning when the outside temp is 5 degrees." - I believe this quote was by the late Frank King, Technical Director of the MBCA for many years. If you don't want to find yourself stranded at the wrong time, do not wait for the battery warranty to expire.
Heat attacks a battery by increasing the evaporation rate of the electrolyte. There is no such thing as a totally sealed battery, otherwise, they would explode. (I'm not sure if this is true with Optima gell filled batteries.) When the car is sitting in the sun and the outside temp is 100 degrees (FL), the temp under the hood will be several degrees higher. Cold attacks a battery by slowing the reaction between the plates and the electrolyte, causing a lower cranking amperage. This in turn accelerates the plating out of the lead sulfate on the plates, which then further reduces the reaction rate, etc....
The best environment would be in a heated garage in winter and a cooled garage in summer. But that's not what we buy Interstate batteries for, is it? I would plan on replacing a battery at the first sign of weakness after 5 years, or sooner if it is on a diesel.
someguyfromMaryland (not an electrical engineer, but sat through some interesting lectures on electrical theory in NTC Orlando many years ago.)
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