8178,
One of the first things you learn, when you start in E-power, is that you never leave your batteries connected, until you are ready to fly. It is as simple as not plugging them in or running a switch in line, and you are told to not always trust the switches.

I've personally never seen one start without a transmitter input, not saying it can't happen, however, it can't happen without the battery pack connected.

Ken