OP.

There is no "one fix" for your reported issue. You can search for weeks here, or listen to a few people replying and you will find that the issue has many potential causes and as a result you are getting varied suggestions for your symptoms.

Without knowing precisely what has been done- diagnostics, no the very short and cryptic data you've supplied- it is impossible to give good guidance.

The root causes can be traced to a few items:
1. BMW uses 'intelligent charging'...decisions about how much power should be drawn from the alternator are done as you drive. Short trips do not allow the system to charge adequately.
2. There are MANY modules that 'hang' on the car's electrical bus which can create current draws. These do NOT turn off when you turn off the key. They can also turn on and off hours after you leave the car- AND can turn on other modules.


BMW has published a work instruction for dealers to completely test for these parasitic drains...it involves hooking the car to a current monitor that logs current draws and times. This does NOT fit into the usual "bring the car in, inspect, diagnose, repair, move to the next car" practice most techs like to follow.

My 2 cents