# Question: Is 12.4 Volts OK Car Battery?

## At what voltage should a car battery be replaced?

The battery must maintain a minimum post voltage of 9.6 Volts at 70 degrees F during the test to pass.

If the voltage drops below 9.6 volts, the battery is “bad” and needs to be replaced..

## What voltage indicates a bad battery?

Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated….2) Take a Voltage Reading.State of ChargeVoltage50%12.225%12.0Discharged0 – 11.92 more rows•Jun 5, 2012

## Is 11.5 volts enough to start a car?

However, when battery voltage drops down to about 11.5 volts or less, there is not enough juice to turn the starter motor. … With the car off, your battery should be at 13.0 to 13.5 volts, once it is charged. If it won’t hold a charge, well, end of story, buy a new battery.

## Is 13 volts a good battery?

When the battery is not being charged and not delivering charge to a load, this is the rule of thumb. For a 12 volt, leadacid battery, the voltage measured between these two points should be between 11 and 13 volts. The closer the voltage is to 13 volts, the closer the battery is to being fully charged.

## Is 11.9 volts enough to start a car?

However, in practice, the normal voltage for most of the passenger cars can be in the range of 12.2-12.49V, which indicates an incomplete charge. A decrease in performance and the quality of the device begins in the case of reduction to 11.9V or less.

## What voltage is too 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.

## How much voltage does a car battery lose overnight?

Thanks for the question. The battery should maintain between 10 and 12.5 volts after a night of not being used. It should have about 10 volts to start the vehicle. Less than that it’s likely the engine will not start.

## Will 12.4 volts start a car?

It’s a good place to start, though. 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.

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 12.2 volts enough to start a car?

12.2v is enough to start the car. It’s a 12v battery after all, it’s just voltage settling after being at ~14v when driving.

## At what voltage will a car not start?

The Minimum Voltage Range To Start a Car. In general, while both the engine and the generator are in the working state, the voltage of the battery should be within 13.7 – 14.2V. If more, then it is harmful to the battery, if less, then it is not fully recharged.

## Is 12.5 volts OK for a car battery?

12.5 volts – Your battery is at a healthy state of charge, but we’d recommend re-checking it within a few days to ensure the voltage hasn’t dropped any further. … 12.0 volts or below – At 12.0 volts your battery is considered to be fully discharged or ‘flat’ and should be recharged as soon as possible.

## How do I know if my 12 volt battery is bad?

If your battery is reading 0 volts, chances are the battery experienced a short circuit. If the battery cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. If the battery is fully charged (according to the battery charger) but the voltage is 12.5 or less, the battery is sulfated.

## At what voltage is a 12 volt 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.