I have a hk450 trex clone, with a yep 45amp esc and 3550kv motor, do i need a seperate bec to run the digy servo's and 3gx controler. If yes which is a good one to get, i have been looking on the net and got confussed with all the diffrent ones out there, my battery is 11.1v 2.2. lipo i would be glad of any idea's. thanks