I’m super jealous at how y’all have 7+ year truck batteries.
Gotta say, it’s anecdotal to me, but I’ve owned 5 Jeeps, 2 F150’s, a Chevy 1/2 ton, 2 Expeditions, 2 Suburbans, and 2 Ford Explorers and now a BMW for my daughter.
I grew up in Houston, married in Dallas and been in Austin area of Texas since 1998.
I have purchased AGM and standard batteries, Sears Die Hard was the main, but in the past 20 have them from Costco and Sam’s and Walmart and I think just 1 Autozone, neve, ever have I had a battery last more than 4 years. They usually go in 3 or just after 36 months, but got close to 4 a couple times.
Texas is listed as hardest on batteries, Florida is 2nd (cold can kill start, but seems to not kill the battery) according to the consumer battery site (could be an idiot who knows).
Every District or General Manager I discuss this with ag these places, laugh and say “yeah, show me a battery that lasts 7 years in Texas”
I asked a ton of guys here, none. I had the paperwork on most, makes me crazy. I wish these state AGM and whatever else lasted that long here.
I’m sure someone somewhere here will say otherwise, mine is just what I’ve seen and a bunch of guys I coached with, friends of my brother that ran Off Road Unlimited in Houston and the Roadwire chain in Texas guys and my buddy the COO and my buddy who has the Central Texas Auto chain. Not a scientific study , but everyone I know has the 3-4 year at best here experience.
My battery experience is just as anecdotal but having lived 27+ years right next door to Texas, I don't think our climates are different enough to explain 40% different battery life. Our average highs and lows are only 4 degrees apart.