I have a PA F-16 and an F-15 each have 5- 7 servos...8611s on the stabs, 9411s on rudders and various std servos on non critical controls. My average draw is 350-400 mah per 6 min flight. I take great care in setting up controls to avoid any binding which will consume great gobs of power with digital servos. Get a amp meter to set up the controls to minimize power usage.