No, not without extensive modification of the case, and 3s LiPo is too high a voltage for the 9x. Use a LiFe battery like the Zippy Flightmax 1800. There are people who WILL misguide you on this, I am telling you right.
Change NiMH On LiPo 2200mAh and has forgotten about problem of the charging on field...
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I have tried out the 9xr battery, and I am pleased with how it works. I put it in my 9xr, and ran it on the simulator. It is holding up very well (all I am running is the TX on it), and I expect no problems.
I am setting up my 12V dremel tool to run on it too (and any 3s LiPo), but I see this one as a good option for it's over and under protection. If my dremel runs it out, it will cut off, so this should work nicely.