You could have a battery arc just jump-starting your car after leaving the AVIC running watching a DVD movie without the car running. :P :P :P The risk of a battery arc is going to be inherent in any electric mod you do on your car, IMHO the Upsolute upgrade is worth the risk... just make sure that EVERY electric load is TURNED OFF before the battery cable is disconnected or reconnected. I dunno, there's probably a fuse for the "computer", have your guy pull that fuse before he touches your battery :?: :?: :?: