What should my car battery voltage be while driving?

Sometimes while I’m driving it feels as if my battery is losing power and my car is laggy so I’m curious—should my car battery be at a certain voltage when I drive?

Mary Cahill · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Car battery troubles can be worrisome, but in most cases, they’re pretty easy to fix. A fully charged car battery should be between 13.7 and 14.7 volts while you’re driving.
One way to test your battery’s power is by starting the engine and turning the headlights on. If the headlights are dimmer than usual, this could be a sign of a poorly charged battery.
If you notice that your battery is lacking power every time you get behind the wheel, it could be caused by one of the following maintenance issues:
  • Your alternator is bad
  • The battery is getting old
  • The battery’s connection is loose
  • The battery is corroded
A mechanical diagnosis of your car’s electrical system can help you pinpoint the exact problem.
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