Quick Answer: At What Voltage Is A Car Battery Dead??

A reading of 12.65-12.77 volts means your battery has a full charge.

12.45-12.54 volts means you have a 75% charge, 12.24-12.29 is 50% charged, and 11.99-12.06 volts is 25% charged.

11.75-11.89 volts means your battery is dead.

Is 12.4 volts OK car battery?

Though not fully charged, a car battery is considered charged at 12.4 volts or higher. It is considered discharged at 12.39 volts or less. Note: A fully charged specific gravity of 1.265 corrected to 80°F is assumed.

What is the voltage of a dead 12 volt battery?

Playing in between the voltage charge ratings between 12.1 volts to 12.9 is a safe place—12.4 being an ideal to keep maintenance.

Can a car battery be bad even if it reads 12 volts?

If the voltmeter reads 12.4 volts or higher, the battery is fine and the problem lies elsewhere. Start your car. If the vehicle is reluctant to “turn over,” it could mean that the battery lacks the cold-cranking amperage (CCA) to start the car.

How do you know if your car needs a new battery?

Here are seven telltale signs that your car battery is dying:

  • A slow starting engine. Over time, the components inside your battery will wear out and become less effective.
  • Dim lights and electrical issues.
  • The check engine light is on.
  • A bad smell.
  • Corroded connectors.
  • A misshapen battery case.
  • An old battery.

How do I know if my car battery is bad?

How to Tell if a Car Battery is Bad –

Is it better to charge a car battery slow or fast?

Many chargers come with both a Slow Charge Rate and a Fast Charge Rate. If possible it’s better to charge your battery with the slow charge rate because it’s safer and puts less stress on the battery which can make it last longer however, it will take longer (usually overnight) to charge the battery.

What voltage is a car battery AC or DC?

AC or DC are two types of current that flow in a circuit. A car battery or any other type of battery release DC volts. If you want to make it AC volts then it is required to add some additional circuits to it.

Can a battery have good voltage and still be bad?

A healthy 12 volt motorcycle battery should maintain a range from 9.5 – 10.5 volts under the load for a good 30 seconds straight. Batteries with open cells may read fully charged in idle, but they fail under a load test every time. Once a battery reaches this point, there is no going back.

Photo in the article by “Wikimedia Commons” https://commons.wikimedia.org/wiki/File:Open_Lead_acid_battery.jpg