Let's face it: you can have the most meticulously maintained vehicle on the road, but it won't start without the right battery, properly installed and appropriately fitted for your driving needs. From ignition to door locks, your car battery is the catalyzing force that allows you to get from point A to point B. The following video is a brief overview of the electrical system that makes transportation possible:

http://www.youtube.com/watch?v=TriS8_X6cTc