I've owned my '03S since new and it's only had 2 batteries - the original for the first 6 years or so and an Interstate battery since then. My car usually lives on a CTEK battery maintainer when it's not in use, but since moving in April I haven't organized the new garage yet to park inside. And now that it's in the shop with the engine disassembled, I am expecting it may also be time for a new battery when I get my car back. But I'm not complaining, I've had great luck with the Interstate and will probably buy another one when it's time.
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