Originally Posted by vanosracing
I can't speak for the 3 Series (E90's) but when I changed my battery last year on the 5 the indy programmed the new battery it to the iDrive system. I was told that with the electronics the alternator doesn't always run, the system monitors the battery charge and the alternator kicks in electronically. Also, people have complained of electronics issues or the battery life being shorter if not programmed. You would be amazed how much data modern BMW's store.
When I changed my battery I took the opportunity to drop-in a 7 Series AGM battery for that extra charge. Last thing you want on modern day bimmers is to lose charge.
What is even more frustrating in modern bimmers is the non presence of the dip stick. You can't even check your oil level anymore and have to rely on the iDrive system.
what is involved in 'programming' the new battery? did you ask your indy shop? or did you see them do it?
because i didnt do it on my 911 when i changed the battery and it seems to be doing just fine so far. of course its only been a few days since i did the change.
i have asked the mechanic that does the basic maintenance on my cars and he has never heard of programming the battery. is this unique to BMWs?