I would recommend getting a normal 49/H8 AGM battery...then finding someone that can register it (if you don't have the software/hardware to do so). This battery class size will have the specs you need (usually 90 AH or higher regardless of the brand).

A 49 H8 AGM battery will have the specs needed for you vehicle (see examples below):

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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)