# What voltage should a car battery read when running?

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## What is the standard voltage of a car battery while the car is not running?

When the probes touch the terminals while the car is off and the battery is resting, the multimeter display should show a reading of 12.2 to 12.6 volts (full charge). This voltage range means the battery is in good condition for starting the vehicle.

## Is 11.7 volts enough to start a car?

What is the acceptable battery voltage for a car? … The normal voltage needed to start the car begins from 12.6 volts. At the time of exploitation, this parameter is between 13.7 to 14.7 volts.

## What voltage is too low for a 12 volt battery?

The lifespan of your battery will be moderately affected if it remains within this voltage range for extended periods of time. 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.

## Is 14 volts good for a car battery?

It should read close to 12.6 volts when the car is off. … If the voltmeter reads between 14-15 volts then the battery is normal. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator.

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## Is 13 volts a good battery?

Check the reading. A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape. Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage.

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. … If your battery cannot even reach a full charge, consider it bad.

## What voltage should my battery idle?

At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on (although some may charge at a slightly higher voltage depending on temperature, engine RPM, type of battery, and the battery’s state of charge).

## Will 11.5 volts start a car?

There is no exact answer to the question. In the standard state, a fully charged battery should show a 12.6-12.7V. … In this case, the voltage is difficult to estimate, but it also slightly falls down, and if it is less than 11.5V, then it indicates that the battery is discharged by 50%.

## Is 11.4 volts a bad battery?

The ideal car battery voltage with the engine running is between 13.7 and 14.7V. … 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.

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## How many volts should a car battery lose overnight?

If you measure the voltage immediately after the end of a drive, it should be more like 13.2, and drop to 12.7 within a few minutes as the chemical reactions in the battery slow down and stop when you stop charging it.