I've added support for a remote, "Ground Power Unit" (GPU) plug which is a fancy way of saying a jumper cable. It adds a special "Cessna-Style" port on the plane that can be used to power the whole system including jump starting the engine and/or charging the battery. Most airports of any significant size will have this standard Cessna power plug available, so it will make a dead battery out at some distant airport only a minor inconvenience rather than a major pain in the rear.
