Eventually your car battery will fail and you will need to replace it. In fact, 70% don't even make it four years. There are some things we can do, however, to make their battery last a little longer.
t's all about the flow of electrical power. When you start your vehicle, the battery uses power to get your engine cranking. As your engine runs, your alternator generates electricity to run all your electrical systems: like lights, a half dozen computers, anti-lock brake system, traction control, power windows, electronic fuel injectors, stability control, air conditioning, transmission servos – the list goes on. Any leftover electricity goes to recharge your vehicle battery. Then you turn on your radio and seat heaters; maybe plug in your cell phone and computer; the kids watch a DVD and pretty soon there isn't much extra electricity to go back into the battery.