The arduino is being powered by a seperate square 9V battery. The two AA batteries are just for the servos, also, I have no idea what the current output is of my AA batteries as it isn't written anywhere. (Forgive me I am bad with batteries)
If the 9V battery is what I know as a PP3 then don't expect it to last long before the voltage drops too low. If you compound this by powering one of the servos from the Arduino 5V pin then expect it to last only a matter of minutes.
Please consider powering the whole thing from 4 AA batteries with the servos powered directly from them and not via the Arduino.