FAQ About Car Battery Voltage
6. Your Burning Questions Answered
Q: What is a normal voltage for a car battery when the engine is running?
A: When the engine is running, your alternator should be charging the battery. A healthy voltage reading in this scenario should be between 13.7 and 14.7 volts. Anything outside of this range could indicate a problem with your alternator or battery.
Q: Can a completely dead battery be revived?
A: Sometimes, yes. If the battery is relatively new and hasn't been deeply discharged for too long, a slow, steady charge with a battery charger might revive it. However, if the battery is old or has been repeatedly drained, it's less likely to recover fully. In some cases, sulfation (a build-up of lead sulfate crystals on the battery plates) can make it impossible to restore the battery's capacity.
Q: How often should I replace my car battery?
A: The lifespan of a car battery typically ranges from 3 to 5 years, but it can vary depending on factors like climate, driving habits, and battery quality. It's a good idea to have your battery tested regularly, especially as it approaches the 3-year mark. If you notice any signs of weakness, such as slow cranking or dimming headlights, it's probably time for a replacement.