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.
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.
How many volts should a car battery lose overnight?
When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. Its power drops from 100% to 25%. At 12.4 volts, a car battery is 75% charged while at 12.2 volts its 50% charged. Consider your car battery charged at 12.4 volts or higher and discharged at 12.39 volts or less.
What voltage is low for a car battery?
Check the reading to see the current voltage of your car battery. Anything lower than 12.2 volts, and it’s identified as a bad battery.
What should a good 12 volt battery read?
A perfect voltage with the engine running is between 13.7 and 14.7V. With the engine off, you should get a reading of 12.6 volts. If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only operating at 25%, and down to 11.9V when it’s completely discharged.
What voltage should my car battery be when not running?
Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If they are dim, that indicates the lights are running off the battery and that little or no charge is being produced by the alternator.
At what voltage is a 12v battery dead?
This is called the “open-cell” or “resting” voltage of the battery. Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it’s about 50% charged.
How do I know if my car battery is bad?
How to Tell if a Car Battery is Bad –