I fly a Cinestar 8 with 3-axis gimbal + 5.8Ghz video downlink, Panasonic Lumix GH2/kit lens, 2x 3S 1200mAh lipo for gimbal and video tx, 1x 4S 6000mAh for copter. I get roughly 9 minutes of flight time with this setup. I think if I added a second 4S 6000 in parallel I could probably get it up...