How do I reset computer after battery change?

it's true - the battery needs to be registered. It changes the charging rate algorithms to lengthen battery life. A BMW specialist would know this, whereas a typical repair shop would have no clue. Our cost to do this is $25. Our $15,000 BMW diagnostic and programming interface will do it. Does your regular repair shop have this tool? Hmmmmm. You should take this very sophisticated, technologically advanced piece of engineering beauty to a trained BMW Specialist (a specialist is someone who only works on one make of vehicle). There are many qualified independent, as well as dealer choices out there. Remember, there is no such thing as a Euro Specialist, or a Japanese Specialist, or a Domestic Specialist, or even a German Auto Specialist - the term would be an oxymoron. A German Auto Specialist would have to be proficient in seven different makes - this is not possible anymore "Jack of all trades, master of none". You can look up an excellent BMW shop by going to the BIMRS web directory (non-profit) at bimrs.org