I know the the remote isn't transmitting all the time or the battery would be dead within a day but I am suspecting that for those with comfort access having the key somewhat close to the car does something to the car possibly. All speculation at this point and I am going to test this theory out this week since my car usually gives me the battery discharge message every other day. So far after moving my keys to the opposite end of my condo on Friday i have not seen the message pop up yet (Monday).

Alan

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Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More photos of my car here