Originally Posted by 335iRlz
I want a free battery
It has nothing to do with a free battery. Nor does it affect the life of the battery. There is no reason for you to get a free battery.
The part that is getting replaced is the connector on the B+ cable that plugs into the back of the Junction Box (fuse box) which is behind the glove box. Some of the old cable is cut off and a new cable pigtail on the B+ with a revised connector gets installed to the fuse box.
You will get your letters. You will all not get them at the same time. BMW sends them out in waves. If they sent them all at once the dealers would be too flooded. If you are that worried, just call your dealer and they will tell you if it applies to your car or not.