With newer automobiles allowing you to plug electronics into outlets and USB ports, our cars are becoming mobile offices for our everyday lives. But when you reach your destination, be sure to unplug your GPS devices, phone cords and whatever else you might have plugged in. Even with the car turned off, many of these items will still pull power from your car's battery. This can wear down the lifespan of the battery and also wear down electronic devices and cable cords. And if you're driving in your own community, where you know the roads without the assistance of a GPS device, just unplug entirely and stash it until you really need it.