This is the battery I put in my 2005 X5 4.4i. Only been in about 2 years now, but no issues so far!

Deka 9agm49 battery

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual