Most batteries die in summer, not winter. Here's why, and how to make yours last as long as it should.
Cold makes a tired battery feel weak (less current available). Heat actually destroys it — the electrolyte evaporates, the internal lead plates corrode faster, and the chemistry permanently degrades. A battery that lasts 6 years in Michigan lasts 3-4 in Texas. Plan to replace at 3.5 years, not 5.
Flooded: traditional lead-acid, cheapest, fine for older cars without start-stop. AGM (Absorbent Glass Mat): sealed, vibration-resistant, required for most newer cars with start-stop or significant electronics. EFB (Enhanced Flooded Battery): middle ground; some European start-stop systems spec it. Putting a flooded battery in a car that wants AGM kills the new battery in 6 months.
A voltmeter shows a battery's resting voltage. A load tester pulls the actual cranking amps the car needs and measures voltage drop under load. A battery can read 12.6V on a multimeter and still fail load test. We load-test free at every visit — there's no excuse for the modern shop to skip this.
Repeated dead-battery events shorten life dramatically. If you've jumped it more than twice in a month, charge it slowly (overnight on a smart charger) and load test. If it fails load, replace. If it passes, find the parasitic drain — almost always a stuck relay, a glove-box light, or an aftermarket accessory wired wrong.
Four habits that double Texas battery life.
Direct Texas sun on the hood pushes under-hood temps 30°F higher. Shade saves the chemistry.
Short trips (under 15 min) don't let the alternator fully recharge. If you mostly do short trips, plug in a smart maintainer weekly.
White or blue fuzz on the terminals is acid corrosion. Disconnect, wire-brush, smear with dielectric grease, reconnect. Free, takes 10 minutes.
A battery that's losing capacity shows it on a load test 3-6 months before it actually leaves you stranded. We do this free.
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