I'm selling BMW Advanced Battery Float Charger System Station. I used once and I stored back in the original box and never touched it. This is the same one I'm selling:
http://www.amazon.com/BMW-Advanced-B.../dp/B0016BRA3M
Lowest price I found online was from Amazon (above link) at $61.54 (+ 9.95 shipping) and I'm selling it for 40 cash pick up in Irvine. If you're not driving your X5M everyday or has a plan to install handheld engine tune in near future, this is a good inexpensive way to juice your X5M with BMW OEM charger.