I just replaced the battery in our '07 E70 3.0 two weeks ago with the exact same one that was in there...a battery that has been discontinued by BMW (they now recommend a 90AH and a 92AH instead of the 100AH that my X5 was originally equipped with). Since I didn't want to recode the car (from what I understand our vehicles no longer have a voltage regulator as everything is computer controlled now ensuring that as a battery gets older it is charged accordingly) nor was I going to pay BMW an arm and a leg to do it, I just did some research to see where I could find the exact same battery locally - and it turned out to be much cheaper!

It is important however, and please correct me if I'm wrong, to "register" a new battery with the vehicle upon replacement so that it knows how to charge it. I can post up a DIY later if anyone is interested.

The battery that our X5 required was a MegaTron Plus/Interstate Battery. MTP-49/H8100 AH. If you call Interstate directly at 1-800-843-0200 they will be able to provide you with a list of dealers in your area. I paid $237 CAD for mine here in Calgary which was substantially less than the $311.65 and the $366.65 that the dealer wanted for replacement ones mentioned above (not including reprogramming cost).