Spent a long time M5 lurking, finally found one that made sense. Have seen lots of info here about key options as well as some conflicting info on the interwebs. Seller only had 1 key left...and that one appears to be dead or not charging. I did find the reprogram feature and tried it...key on engine off...position 2...pull key out within 5 secs, hold the button etc to program....didn't work! Since I need a spare key anyway should just get a new one from the dealer, or is there another option. They do sell blanks thru locksmiths and interwebs at places but it seems unclear as to how much programming is required and how much or little time would be needed with dealer. Also saw conflicting info on the batteries whether rechargeable or not. Can someone please confirm before I cut this fob open....I also saw a post on this board that the program new key feature works if the fuel filler door actuator is working as it should too. Needless to say I need some advice.