Two EZ-Robot S08NF STD servos committed suicide?

While I was building and testing my new biped robot, I thought that two EZ-Robot S08NF STD servos committed suicide. I tried to test them on Arduino Uno board with Servo Sweep code but they don't work. I tested a Futaba S3003 servo on that board and it worked. I tested that servo on Dagu Spider Robot Controller which is based on Arduino Mega 1280 board and it worked. Did the EZ-Robot S08NF STD servos committed suicide?

What did you use to power them ? What voltage ?

// Per.

I was using 7.2VDC battery pack usually used for RC cars.

jeffmorris:
I was using 7.2VDC battery pack usually used for RC cars.

What is the max/min voltage ratings for your servos?

Most servos cannot handle more than 6V, so you probably just killed them.

// Per.