hello, my son has a Apache Catamaran 2.4 EP RTR by Pro Boat that runs the 7.2 2200 mah batts. Can you you run 11.1 lipos in this and what do you have to do if so? Have alot of them for planes that are 3s 20c but they are brushless and see on youtube where they say they run lipos in this. Dont know alot about electrics sorry but know I will know. Thanks

Thats a pretty significant voltage uprating. If the ESC can take it at all, I would run it carefully on the first runs and check temperatures regularly, on motor and ESC.
If nothing is getting too hot, you can try running it a bit harder, still checking temperatures.

But the first thing to check is the maximum input voltage of your ESC. If you are in luck, this is stamped on the ESC itself.
The ESC have to handle at least 12.6 volts, or more, to handle this upgrade. As 12.6 V is the voltage of a fully charged 11.1 V lipo pack.

ok so this does answer my question that i didnt really ask in my post. you can run lipos not being a brushless esc or motor? Worst case is to get a bigger esc? thank you very much

You can run brushless on NiMH, NiCd or LiPo.
Same with brushed, you can run that on any battery type aswell.

The only catch is the low voltage cutoff function that most new ESC does have incorporated, with prevents you from overdraining the battery.
This is extra important on LiPo batteries, since over draining them WILL damage them.
That said, most modern ESCs does have low voltage cutoff function for both battery types, and switching between is just a matter of programming the ESC.
Just make sure to get it right