The battery provides the energy to start your motor. It also runs things like the headlights and radio if your motor isn't running. The battery is recharged every time you run the motor. However, car battery life is limited. The average battery life is about 5 years. When it wears out, your battery just won't keep a charge. A dead battery can leave you stranded at the most awkward time, so it's good to have your battery checked regularly.
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Most car batteries last about five years. A battery may last shorter or longer, depending on the way you drive, the weather and other factors. If your battery is 3 to 5 years old, it’s a good idea to test it.
Some newer batteries have buttons that change color to show you when the battery is low. Slow cranking—when it seems like your car is straining to get started—is another sign that the battery is worn.
Yes, they all wear out and need to be replaced over time.
Auto makers use warning lights to alert you to problems.