That's a perfect pic, just what I was looking for.

It does have the same polarity (they not only have to have the same connector, but the same polarity). It should work just fine if the battery you are charging is atleast 700mA. The stock battery for the CX2 is 800mA, so that should be fine.

I would make sure to treat the battery like it was going to blow up the first few times I charged it, and also note the temp during the charge. If it ever gets above 90F, stop the charge and wait for it to cool down. If it does that more than a time or two I wouldn't use the charger anymore. You shouldn't have a problem at all, but I'd rather tell someone to be too cautious than not cautious enough.

I still have yet to figure out why the CX2 charger has a 650mA charge rate on an 800mAh battery. It should be 800mA charge rate. Maybe it's just because it's a beginner heli, and they'd also rather err on the conservative side, especially with folks who are not used to lipo's and the dangers associated.