Ah...thats their AGM battery...specs should be around 13"-14" in length....and I think it vents on the side...so make sure not to lose your elbow (if you still have your orig battery) that connects the vehicles vent tube to the battery's vent hole.

BTW, when I look up the BMW battery for my 06 X5 4.4 (BMW part # 61217586962)...it is an Exide battery listed as a 90 Ah battery with only 720 CCA...and an MSRP of $169.61.

Here's the specs from AZ's website of compatible H8 batteries they sell for the e53 X5...prices are set locally, so some prices may be higher or lower than what I have listed... (click links for more details):

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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)