Just clip the red (power) wire from the ESC to the RX to disable the BEC from powering the RX (you now need an RX batt pack), and install a switch between your 9V batt and the ESC, if your ESC doesn't have a power switch on it already. If you want only one switch, you can get a dual throw switch that will turn power on/off to both the RX and the ESC... a SPDT switch will allow you to turn power to both on/off, and a DPDT switch will allow you to switch the batt s from the RX/ESC in the "on" position", and then to charger leads in the "off" position (like regular RX pack wiring harnesses do).