You may not give your car battery enough thought.
Battery trouble is a leading cause of roadside breakdowns, according to AAA research. Yet most people don’t periodically test their car battery. A battery on the brink of dying rarely warns you before it fails, but getting a simple battery test can.
Here’s what makes your car battery tick—and how you can get help predicting when your car battery life is nearing its end:
How a car battery works
A car battery creates electricity through a chemical reaction. A series of lead plates contained in cells interact with an electrolyte. The resulting chemical reaction generates electrons, which travel through an outside circuit to create an electric current.
When you turn on your car’s ignition, the electrical charge is released to the ignition system to start the engine. Once the car is running, the battery’s job is done and the chemical process reverses, recharging the battery as you drive.
Car battery types