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)

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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Life is not fair!
You can't protect people from their own stupidity!
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