So as I am leaving work yesterday, my X5 won't crank. Since I had had a couple odd electrical gremlins the past couple of days, I suspected my 5 year old battery had finally died. Got a jump start by one of the other folks leaving with me, and went home.
I did a quick search on XOutpost for battery replacement threads, and learned exactly what I needed to know. Thanks everyone, especially MotorDavid's posts.
I got a replacement at my local O'Reilly Auto Parts this morning, and replaced my battery without any headaches at all. Cool, eh?