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The Interstate battery in my 964 is nearly 2 years old and so far, no sign of performance drop off. It cranks quickly even after leaving the car sit for a few weeks.
My experience is that batteries should last longer (5 years or so) unless they are subjected to harsh duty. My wife's car is a couple of years into its second battery, and the original battery lasted 6-7 years.
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Jim R.
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