Car will turn off automatically. Radio and infotainment shuts downs after you exit. If AC was used, car will automatically turn the fan on after you leave to dry out the evaporator coils or big smell will occur after a few months. You cannot disable this other than never use AC. And the only real killers of battery charge are Sentry and Cabin Overheat Protection. You need to decide if you want those running once you leave the car.