General wisdom says you should replace your car battery about every three years, but many factors can influence its lifespan. You might need a new battery before the three-year mark depending on the climate where you live and your driving habits.

When should you replace a battery?

Batteries can become worn down in as little as three years

After three years, it's normally time to install a replacement. After four or five years, most car batteries will be almost completely unreliable. Old car batteries can present a number of safety and reliability issues.

Should I replace battery myself?

A dead battery is a major inconvenience. When the car doesn't start because the battery fails, your commute or travel plans are put on hold. ... But if you are at home and can get a lift to the auto parts store, you can replace a car battery yourself.