As per an older thread, my SA says these car batteries are *supposed* to last 7 years but of course it depends on recharge cycles and climate.

Also, for the "just replace it" people - doesn't it require a "reprogram" after you do it? That's not a do-it-yourself... wishful thinking. What have you people done to get past this if not just shelling out the cash to BMW?

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr