Yes, 9v in 2 servo motor since the available battery I have right now is only 9volt , btw the servo is sg90 so I only need 5v to 6v , therefore I use voltage regulator l7805 each servo. But if I will going to use 4AA batteries, are you sure that the 2 servo will work? Maybe only 1 servo will work. If that will be happen , I will going to use another 4 AA batteries for the second servo?