The battery that dies on a cold morning was usually murdered back in August. Heat is the real killer.
What heat does inside the case
High under-hood temperatures evaporate electrolyte and accelerate corrosion on the plates. The damage is cumulative and silent — the battery still starts the car all summer, then the first cool morning exposes the lost capacity. In Southern California, a battery over three years old is living on borrowed time no matter how healthy it acts.
Quick tips
- Have the battery load-tested every summer after year three
- White or blue-green crust on the terminals accelerates failure — clean it
- Short trips never fully recharge a battery; an occasional long drive helps
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