I'm not sure how old battery is. I only had car a couple moths
The warning usually comes on when I first get in and start the car
Only come on a couple of times once a month ago (I assumed as I park on slope)
And a couple times last few days
I noticed tonight when I started car there is a button on dash (slope icon) 2 buttons away from front pdc and that lit green for a few seconds when starting then went out. Not sure what that does /means?

__________________
2005 E53 X5 post facelift