Thought I would share with you guys some testing with my Phantom 1.1.1 stuffed into a Phantom 2 shell and the Turnigy Multistar 5200 man 4S 14.8V battery I've been using lately. I tested it to exhaustion in this video and got a significant improvement in flight time. I usually get 11 minutes of safe flight time using my Turing Multistar 5200 mAh 3S 11.1V battery. By Safe Flight time I mean that I still have enough battery to get back to wherever I am before the battery hits a auto landing point. With the 4S battery my flight time has increased to 18 min 30 seconds to auto landing, so I figure I should be able to get 15 minutes of Safe Flight time out of this battery. And this is with aggressive flying as I use the Phantom to keep up with boats moving at up to 23 mph. I've always seen people posting that you shouldn't use a 4S battery in the Phantom1 but I don't seem to have an issues as yet using it. Granted I have only done three flights so far to figure out how far I can push the battery. Hope this answers some questions for all of you thinking about getting a 4S battery for your Phantom 1!!