From Al Stensby Fullerton Calif, 2007 328i Sports wagon, 30k miles Regarding "We Can't Change Our Own Batteries " in the February issue of Roundel: I have a 2007 328i Sports wagon I replaced the battery myself ($145 at O'reilly) last month and the only information I lost was the time on the clock. Even the radio presets were maintained I initially called the Dealer and got a quote of about $450 for them to do it because they would have to "reregister" the system after the installation. However the service rep said just go ahead and install the battery and if it didn't run right then they would perform the "reregisteration" as a separate charge. The only glitch I had was there is a gadget on top of the battery which I had to remove and I'm not sure what it is. It is part of the positive cabling and is held on top of the battery by a couple of spring clips. Once I figured out how to get it off the rest was easy. Also in a previous issue you had noted that an aftermarket battery migh not have a connection for th gases vent. The O'reilly battery has the same vent connection. I especially enjoy Tech Talk and The Hack Mechanic.