Sounds like a faulty battery, IME. There was a point on mine I’d replace them every 4 years as they were crapping the bed at that point. This last go-around lasted longer, and went with an AGM.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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