Buy a GOOD battery and don't "cheap out". As with most things you get what you pay for....but even then sometimes you get a lemon. I suggest you buy locally from someone that will stand behind the product they sell.....just in case.
In "the big picture", batteries are one of the least expensive investments you can make on a Porsche.
Personally, I've always installed Interstate brand batteries on my vehicles and so far they've performed very well.
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98' Boxster
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