 Beginning May 15th 2009 the battery went dead 9 times, always when I needed it most, until Nov 13th &  the service dept was no help at all.  They actually had the salesman deliver it to us on Saturday night Nov 14th saying it was our problem!  It was our 3rd X5 & we'd had with no trouble with the others but I fixed the problem myself by buying a Mercedes GL450.  bye bye bmw!