Don 
2009 BMW X5 SUV xDrive48i 4dr SUV AWD (4.8L 8cyl 6A)
Dead Battery
 Huge problem with the battery system.  The push start system has no accessory mode, therefore if the engine is not running and you turn it on to use the radio, phone, DVD, etc.  The battery will drain in 15 minutes.  No indicator, no warning, just dead battery.  The dealer service departments say they have to put the car on a charger just to work on them or the battery will be dead.  The BMW answer is you have to have the engine running "all the time".  Forget the after engine turnoff heat, you can't use it.  Forget the DVD player that logically you can't use while driving, but you have to keep the engine running.  If you expect to use your car a lot like I do, forget it.