RE: CMP C-160 Transall Electric Conversion
Battery Eliminators on MOST ESCs are "analog", not switching mode.
That means that the higher the voltage the LESS current output they can sustain before blowing out.
That is why most analog on board BECs are rated for NO MORE than 2-3 servos at 11.1v!!!!!
By the time you up the voltage to 14.8, the on board BECs are all but worthless if not dangerous!
A few more expensive ESC's feature switching mode BECs, which can take higher voltages. But normally a premium is charged for these ESCs.
Most manufacturers forgo the BEC's altogether for the higher voltages and only provide the ESC function.
Standalone BECs are fairly cheap ( $9.00 - $18.00 ea ).
I normally will either power the servos off a NiMH pack directly or I'll use a seperate switching mode BEC.
At times I've also taken smaller LiPo packs that don't sustain the draw I want ( say that they don't produce 20C, and instead 12C when tested ), put a BEC on them, and use that to power the electronics via a BEC.
This is normally very reliable, as if either of the ESC's ( or both! ) burn up, or get shorted, I still have control of the plane.