Quote:
Originally Posted by rking117
This is also not true. I changed mine without it. i de-engergized the system by removing the negative cable then positive. From there took out the old and put in the new. The car cranked right up. The only thing i had to do from there was call the dealer and make appt to have them register the new batt. But since he has Carley (she must be hot to have everyone after her like that) the update will be instantly applied after he plugs her in.
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Agreed. I have never attempted to keep power to any of my BMWs while changing the battery or removing it for some other electrical work. All memory settings, radio settings, etc are preserved as well.
** Just don't close your trunk/boot with the battery out!!