Really it could be any of the three main components; battery, battery cables, or starter. They can all give the same symptoms. I'd start with the easy and cheap parts first (have the battery load tested and clean and tighten the battery cables) and then go further if the problem isn't resolved.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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