Hi,
Currently doubt this is the case as when the battleswitch is without the external power source, the power LED lights however your theory ould be right so I will test the signal quality to see if the signal is operating as expected with a scope.

Also the battleswitch we are using is an LX Robotics one found in link ( https://github.com/lxrobotics/Battleswitch ). I will test the signal quality to see if the signal is operating as expected.
Cheers