I recently got the 2010 enhanced version of the jg m4 s-system on amazon, and I'd like to know if a 9.6v mini would fit without modification (though I'll probably move the wires over the barrel like crazyncman's video on youtube). if so, anyone know of a decent and affordable 9.6 mini (as in roughly $30 or less)? and am I correct in assuming that the 2010 enhanced is capable of handling a 9.6 without internal mods? ill probably modify it eventually anyway, but not anytime soon.

Yes, yes it can.
I have that exact same gun. It takes the 7 cell 9.6 mini battery just fine.
It will be a complete biotch to pop in at first until you learn ho to get the wires just right. But once you do it a few times, it's easy (a heck of a lot easier than getting the same battery into my Masada).
I will say this:
1) tuck all the wires under the barrel (under, when looking at the barrel from upside down... so really above the barrel).
2) line up the edge of the battery with the curved edge on the barrel... you'll know what I'm talking about when you look).
3) Make sure to watch the wires when you close the hand-guard. The guard will slice through those wires easily (I have on mine).

Enjoy the rifle.

Many will bash JG for it being a clone. However, I have several expensive rifles, and my JG is the most dependable.
It may not fire as fast as the others stock, but it shoots hard, accurate, and takes a beating. In three years, I've yet to have to repair it, or replace any parts. And it gets TONS of use, as I loan it out to people all the time (as I use my other rifles more).