My ESC has a built in BEC, but I want to be able to power the radio without connecting the motor battery. Is it OK to power the receiver with a separate battery while the throttle cable from the ESC is also plugged in? When I tried that the ESC issued its startup beeps and the motor tried to run if I moved the throttle stick. That doesn't seem right, but I don't know.The receiver and servos did work, though.

Jack