So, I have 8 servos that I want to drive with my Arduino. I know I shouldn't connect all the servos to the GND and +5v of Arduino. Somebody told me that servos when working pull about 2 amps each Is this correct? How should I hook an external battery with Arduino to my servos? I am told that I can hook up DC jack into Arduino, an external batteries GND to Arduino's GND, and the external batteries + to +5v on Arduino. Is this correct? Please help me out here.