Yes, no need for an amp, if you don't want one. Just grab some rechargeable batteries as you said. 
Just going back to one of your earlier questions. There is a microphone that picks up the outside sounds, then the headphones NC circuitry creates a 180 degree copy of the outside sound. These sounds cancel each other out, so the user only hears what is being played through the headphones, and not outside noises. This is the reason for the slight hiss.
NC is not 100% going to block out everything, but it does do a very good job.
Edit: I think most NC HP's cancel out 70% of noise, after doing a bit of reading. That probably depends on where they are used though. As Uriel mentioned, they are best at cancelling out drone noise. I guess using them at a club or something, as a test, they wouldn't be very effective at all, as music changes too quickly.

Just going back to one of your earlier questions. There is a microphone that picks up the outside sounds, then the headphones NC circuitry creates a 180 degree copy of the outside sound. These sounds cancel each other out, so the user only hears what is being played through the headphones, and not outside noises. This is the reason for the slight hiss.
NC is not 100% going to block out everything, but it does do a very good job.

Edit: I think most NC HP's cancel out 70% of noise, after doing a bit of reading. That probably depends on where they are used though. As Uriel mentioned, they are best at cancelling out drone noise. I guess using them at a club or something, as a test, they wouldn't be very effective at all, as music changes too quickly.
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lol need them for uni though so not much choice.