I'm about ready to hook up the Dice and iPod (CD connectors are out from under the console storage box and in the trunk area). Instructions call for disconnecting the battery before doing so. Last time I disconnected the battery (to install a new one), the defualts for the A/C go messed up and I had to have BMW redo them. At least that's what I thought happened as the A/C went at about the time I installed a new battery...could have been coincidence, though. Anyway, although resetting the defaults was covered by my still existing warranty, I don't want the hassle again. So, I'd like to know if anyone has not disconnected the battery before the install and what was the outcome?