I recently installed the 3rd battery in 14 years, average 7 years each. Never done any alternator work in that 116,000 miles. Air conditioning is on about 98% of the time, seldom has the radio been silent, have an aftermarket amp, meth pump is running much of the time, replaced the clutch fan with electric fan, list goes on. Fully loaded X5 and same electronics as other E53s. I got the only one that doesn't eat batteries and alternators?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas