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If the battery appears 'weak' (which the IC light test seems to confirmed), test it using a load tester.
But it does sound like you have a going-bad ETA. If you read my scenario (Menu#24) when mine started to go, the same events happened.
If your car "sits" for a few days, that shouldn't cause the ETA to be 'marginal' but the battery is further stressed esp since it appears to be weak.
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Regards . . . . JimF
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'94 S500 Cpe
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