Your battery is one of the most important parts of your car. Even if you have a great, efficient vehicle, or one that offers top performance, it’s not going anywhere without a working battery. Unfortunately, leaving the lights on, or simply having too many electronic devices hooked up to a car that hasn’t moved for a while could result in a dead battery. You may not discover it right away, either. One day, you put the key in the ignition, and all you get is a ticking or dragging noise, or only the lights will come on. You might have a dead battery.