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I've had an Optima red top in my 911 for probably 5 years now. I never have to put it on a battery tender (I have a cut-off switch), and the thing always cranks without effort. I bought a Porsche replacement battery for my Box S from the dealer because I didn't want to deal with the hassle of making a mounting bracket. Other than that, I wouldn't have thought twice about putting one in the car.
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