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I was under the impression that battery life is more dependant on usage than just on time. In other words the projected lifespan of a "48 month" battery is predicated on the expected usage of the vehicle during that time.
A battery in a low-mileage car could last far beyond 48 months, while one in a high-mileage car would not.
I'm not arguing against replacing an old battery, just that age is not the sole determinant of how long a battery will last. It it were, the length of time the battery sat on the shelf before being installed in a vehicle would have to be taken into consideration as well.
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