I just changed out an Exide battery last year. It only lasted 12 years or so.
Check out this post for info on the "Sleep" mode.

Light on Steering Column won't go off? - Bimmerfest - BMW Forums

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i