This may help. Your interrupting the signal and not the actual power. This being said your tank is in sleep mode so the power is still there for something to go wrong if your tank receives an errand signal from somewhere. To cut the battery power, like Ausf said you'll probably need to have aux power source to the RX for the switch.

http://www.desertarmor.com/DAK2/Radi...to%20Sleep.pdf