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Car batteries don't care how many miles are on them. Time, vibration, heat and cycling kill batteries.
-In the north I'd change out batteries regularly that were 6+ years old. Here in FL, 3+ is normal. Heat kills batteries.
-if you have vibrations in your car or drive regularly on a rough road or don't have the battery properly tied down, you'll get less life from your battery. So if you have modified your car and have more NVH, you're reducing the life span of your battery. Catless exhaust, solid engine mounts, hard trnsmission bushings etc all lead to shorter battery life. If you have modified your car and have more NVH, use an AGM battery. They also deal with cycling a lot better.
-cycling is when you run the battery voltage down (like for ex leaving a light on too long) and have to recharge it. If you don't recharge properly- on a dedicated battery charger and disconnected from the car- you'll kill the battery that much faster. If you just run the car and recharge the battery with the alternator not only is it bad for the battery but it's bad for the alternator too. Abuse is the #2 battery killer. Time is #1.
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