I am sure this has been asked but the search did not show any. I think it is somewhat obvious that the power source increases lifting capacity &/or flight time (unless props bend). Has anyone cobbled together a P v1 (non vision phantom) with a second battery? What were your results? Thx! I ask because I would like to use a larger camera & better than either GoPro or Vision cam and of course would like 15mins or more flight time, have seen Pansonic GH3 and Sony NEX-5r on non Vision and they flew ok, not fabulously but ok for my intended use. Also have seen the same cams on S800/equiv and they flew wonderfully but those are out of my price range for now.