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What chronic problem can kill a car battery over time?

Asked by robmandu (21331points) August 20th, 2009

My vehicle is great, except for one thing. It kills batteries. It can happen in as little as 18 months… and my 6 year guaranteed Interstate battery is dead. Not too terrible as it’s replaced for free or a nominal charge.

Each time, the auto shop checks the alternator and it comes out fine. I’m on my fifth battery now in 10 years though.

What else could be the culprit?

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