Take a battery pack. You'll need to open the rear hatch and tailgate. Both can be opened manually, but push button will be easier. A few bolts need come out the spare tire area. I found an OEM instruction booklet on how to install it. I can't remember if it's in PDF or printed format. Let me look for it.

__________________
'06 X5 3.0i - bought @143,123 miles (12/26/20)