Originally Posted by doughboy
Jon, was this on your 640i?
If so, the battery is detective or failing, or it wasn't charged properly before you left it. No way a new car should do that.
I often don't run mine for 2 or 3 weeks, even in winter parked outside, never an issue.
Sure a charger is fine for a winter layover, but no need for a couple of weeks or so.
The car is one year old, not new, but I agree that I shouldn't be experiencing battery problems.
Following an hour's run last Saturday everything returned to normal and I've had no warnings since.
Last night I was showing a friend all the fancy instrument lighting functions, after which we retired for several glasses of wine - five hours later I found that I'd left the side lights on, but there were no problems with starting this morning.
It probably just touched on the low-voltage warning trigger point when I was away and the 200+ miles I've covered since has fully recharged it. Nonetheless, I shall still give it a monthly topping charge as a matter of course.