Outch. That's really not nice, especially as I am not sure how much I would trust a battery after this, based on how reliable or unreliable the detection process for the problem is. I think I would ask BMW for a replacement just to make shure they have to ensure in writing that there is no risk from that battery and they take liability for everything that happens related to it. Otherwise you accepted that no action is taken based on a shaky test for the problem. Happy my 2019 Roadster isn't affected (this time and for now).
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