[Dave at Pelican Parts]

But it is only needed if your car has the Intelligent Battery Sensor. IBS cars have a plastic "box" on the battery ground cable, as shown in the following image:

http://www.pelicanparts.com/techarticles/MINI_R56/23-BASICS-Battery_and_Connection_Notes_Replacement/images_med/pic07.jpg

If you do not have that on your car, you should not need to register the battery at all.

--DD