Originally Posted by burkleymh

It really is a good idea to turn everything off before turning off the ignition - the X5 is a power hog with all the sensors and OBC - others have mentioned draining their battery by listening to the radio while washing the car (something I always used to do with my American cars without fear of battery drainage) - I also hook up the BMW trickle charger if the X5 won't be driven for the next week (or longer)