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No, those are the NYKO battery packs you're thinking about.Like everyone else said, it is most likely just going to be used to adjust the camera. I think I may get it, KH2 had the best camera out of all the games and I assume that is how this one would function. Also, isn't it also supposed to extend the system's battery life?
I'm getting it personally. KH2 had the best camera to date, I imagine this will control similarly.
Both games would still be the same quality they are now regardless.