http://www.bimmerfest.com/forums/sho...d.php?t=903551
comfort access keys have a battery .
You can try putting the other type in an inductive
charger such as a toothbrush charter for out of
car charging.
programming comfort access keys seems to be
the hard thing to do . As there are only two positions
allowed in the cas for CA as Mashman said in the above link