WWONG and TerminatorX5,

That didn't work for my X5 three nights ago. I had left the glove compartment open overnight. The light in it was still on in the morning. The X5 would not start; the battery was (almost) completely dead. I had to re-charge it.

I tested my battery and it's border-line. I'm going to get it replaced.

basora,

The battery classes that you listed are not correct for our 2008 X5 4.8i models. Not sure what battery I'm getting yet but may need to set that value.