Autozone...
Take the old/dead battery with you, they have the same or smaller size, with vent, perfect fit, years of warranty, $100, case rested!
I have the "medium" qualty in the Boxster, Audi and other German cars over the years, never any problem whatsoever.
As a matter of fact I took a smaller size for the Boxster to save some weight and there is absulutly no problem with my choice. Granted, I only drive in the summer, for year round and colder temps I'd take the regular size.
An alternative would be an Optima (check Costco!), or, for leight weight a Braille.
Our local Porsche dealer wants $ 400 for a new battery, yeah, right!
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'14 Boxster
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