Curses! I have had my Radius for a couple of months now and never had the screws loosen up on me much less come out. I read this thread, go out on the town with the Mrs. and blamoo! Lost screw. I have always charged the critter via micro USB with no reason to open the battery bay. I do a thumb check on them regularly and now this! Cursed I tell you! <flails>
Sorry to hear you lost one! I've noticed mine get loose and I've never changed the battery either.