I have a question about using Calumet 750r Travelites with a Paul Buff Vagabond II Battery Pack - Would you leave it set to "AC" and plug the 750r into the Vagabond like a wall socket? Or do you switch the travelite to "battery" setting? I ask because I just got the vagabond. Tested it yesterday and just left the 750r on the AC setting. It seemed to work fine. I was shooting indoors so I plugged the 750r back into the wall and shot 200+ photos. Today I was midway through finishing an indoor shoot (still plugged into the wall) and the same travelite I had tested the Vagabond with started smoking profusely and seemed to die. Sending the 750r in to get it fixed (I still have 2 that work ) but I'm a little worried about trying the other 750r Travelites with the Vagabond again, and the Calumet website is woefully lacking in support info. Any help is greatly appreciated!