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Does the voltage of a car battery decrease over time?

I’m a new car owner and concerned about my car’s battery voltage decreasing. However, many have told me that this isn’t true! So, can you help me understand whether the voltage of a car’s battery decreases over time?

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Annette Maxon · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Great question!
As you drive your car, you’re recharging the battery, but the voltage of a battery can decrease over time. Ultimately, if you have a faulty alternator, leave your headlights on overnight, have a bad charging system, or there’s some other electrical drain that uses energy even when the car’s not running, then your battery voltage will decrease.
Generally, this isn’t an issue, especially for newer cars or those kept in good condition. But, if you’re looking for other ways to keep your car in working condition for as long as possible, look further than
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