In regards to the IBS and registering or not registering a new battery (when it's been changed)...see the last paragraph in the info below...it doesn't say "damage" will occur...but it does say that "power management will not function properly"...

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)