Not really, BMWs have a battery management system that needs to be cleared of the learned calibration when the battery is replaced. If it's just disconnected an

Not really, BMWs have a battery management system that needs to be cleared of the learned calibration when the battery is replaced. If it's just disconnected and not replaced then you don't want to clear it. Also, if that were true it would make doing any work a terrible experience even for the dealerships. Heck the service manual probably says to disconnect the negative battery cable before changing windshield wipers.