I have one setup with Castle 160, Scorpion 4530-500 (13T pinion), 716/106 blades, 1950/2050/2150 head-speed, and OptiPower 12S 5000 mAh 50C stick packs. Second one is Castle 160, Scorpion 4525-520 (12T pinion), 696/106 blades, 1950/2050/2150 head-speed, and two OptiPower 6S 4300 mAh 50C packs. I really like the lighter batteries 4300 - 4500 mAh, but with the 716s the 5000 mAh doesn't seem to fly much heavier...