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Yep, the car had 1 or more serious amp draws killing multiple batteries. AGM batteries are fine but any battery taken all the way to zero will be deeply damaged. Same with FLA. Hopefully the alt represents the lion's share but I would test each circuit and record the amperage draw for each to see if there are other problems. Get as close to zero mA loss as you can.
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2009 Cayman PDK
With a few tweaks
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