In order for a switch to absolutely, positively cut off all power to the plane, it will have to be inline with one of the battery leads. This means the switch must be able to withstand the full current of the power system. For many planes, this implies a pretty big and heavy switch.

lwatson is absolutley correct about the switches on ESCs. They do not completely cut power consumption, and your battery will be drained within hours or days.

But of course, lipos should never be stored or charged in your plane anyway! Lipos should always be stored and charged in a safe, non-flammable container.

- Jeff