I'm not sure why but its very common for a battery to fail all at once. They work fine right up to the moment that they don't! Often there is no warning such as the classic "slow engine turn over on a cold morning". Thus, I replace batteries based on date rather than function.
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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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