bobert, that ESC you listed is for an r/c car/truck. How were you planning on controlling it? Normally it's done via a transmitter and receiver.
And most receivers are rated to a max of 6 volts to operate, the built in BEC (battery eliminator circuit) won't handle anything over the 3 cell lipo voltage and be able to drop the voltage down to 6 volts. So you would need to disable it and run a receiver pack of 6 volts.
All that said, you can use a servo tester in place of the TX/RX, you can pick one up for around 10 bucks. Basically it's just a potentiometer. You would still need a small battery pack to run it on the 6 volts max it requires
Something else, those ESC's have forward/reverse/brake built in, on a car set up, the trigger on the transmitter controls the functions.
So using it for something else can be a little tricky.
You would be better off with an ESC for an airplane, only has one direction of rotation. So no reverse or braking to deal with.