Damn.... I just came upon this thread and hope my dealer (in Panama) knows what this is and can do it.
I bought a $350 battery (I bought the bigger spec one they had listed for the 335, there was also a $299 one) for my 335i last week cause the original is dead but they didnīt mention anything about registering or coding at all. They just told me it wouldnīt be covered by the 2yr warranty but because they werenīt installing it and thatīs it. DAMMIT!