Quote:
Originally Posted by Audun
I thought the whole electrical system would go haywired if you just detach the battery.People have been using an extra battery hooked up to a obd plug to counter this.Or maybe that was something about registration. Clock, radio and registration numbers.
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I recently changed my battery with no external power and had no problems.
Your clock and maybe radio presets may go away but that is easy to fix. I've read about more problems being created by hooking up an external battery. Personally, I'd be afraid of putting any power to the obd port. However, since your car is an EU version and 2004, it might be a different matter. There is a UK based forum, BabyBMW.net, that might be a useful source.