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Nothing special about the P-car battery except the physical size and positive, negative placement of the posts. Should have a tube for venting if not an AGM. So recent a battery should be under some warranty coverage. But also test your alternator's output. And clean the contact posts/points. If I could do it, anyone can.
The 986 (Model years 1997-2004) takes a BCI Group 48 (12.1X 6.9 X 7.6"), the 987 (2005-) takes a BCI Group 94R ( 12.4 X 6.9 X 7.5 "); both right hand positive terminal. The 94R is also slightly lower in CCA.
The 986 Tiptronic battery is bigger than the manual transmission version. They are listed this way in the general section of the official repair manuals:
Ah/A 60/280 Manual
Ah/A 70/320 Tiptronic
So buy a bigger CCA battery if you live in colder climes, drive a TIP Boxster, or have a bigger amp in the car.
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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