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As far as I understand it, the battery has to be registered so the car knows the capacity, max & min. voltages, charge rates, etc. so that it can accurately charge & discharge as needed.
I don't know what the process is to do this through BMW. I do know that with the BMWhat software on iOS, you can purchase in-app the ability to register a new battery with an OBDII wifi adaptor and your iPhone or iPad. I think it's $4.95 for unlimited licences.
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