Thanks. But I was already fully aware of the key in the fob.

Perhaps I should have been more specific; The question was (and still is) whether the driver's door lock is both manual & electric or only electric.

Note: the manual key does more than just lock/unlock the driver's door. For example, it tells the car that the door has been locked/unlocked which triggers the appropriate audible and visual ques (if you have them set in the iDrive). So it is not clear to me that the driver's door key/lock is physically attached to the locking mechanism and hence would unlock the door if the battery were completely dead. Or whether the driver's door lock is merely a key operated electrical switch.

FWIW the manual key has at least one a trick up its sleeve that the fob buttons do not -- if you hold the key in the lock position it will close all the windows

Funf Dreisig