the reciever is an open circut. you can plug the battery in anywhere. the same reason that you can plug a battery into a y harness with a servo. as long as there is power going to the reciever, the hot and common are active. that is why when you turn everything on and you try to turn a servo it won't budge. the motor is correcting for it. the signal wire is jsut a pulse width. you can but the batt lead anywhere.