My first post!
I just changed my battery today.
There are two issues you should be aware of registration and coding CAS correctly if battery different.
Registering is letting the computer controlling the charging profile that you have a new battery as the charging profile changes over time. Registering can be done by the dealer or with Tools32.exe, INPA in older models, Easy-DIS and others.
Coding is only required if you purchase a battery of different capacity. I read my CAS module and saw that my E90 had 90ah_agm so I purchased the same. This is so the charging profile matches the capacities of the battery. It is easier to replace with same battery as you do not have to recode and for the person down the road who replaces with the proper battery and does not check that you reprogrammed CAS it could cause a problem.
There are good tutorials on removing/replacing the battery, registering, and coding on the forums.
Registering started on the 7 Series in 2002 and on the 3 Series in 2006.
The settings available in CAS are:
Last edited by George Ab; 01-09-2013 at 10:23 AM.