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Those machines don't tell the voltage or how charged the battery is. Normally in off load, its about 12.6 volts. A good healthy car battery should register about 12.6 volts. If the voltage falls below 12.4 V, the battery should be recharged as soon as possible.

In an ideal case, an open circuit voltage of about 12.8 V is measured with a Multimeter.

Check up on the battery during this process as it should have the voltage values of about around within or above a 9.6 in voltage rating. 3). When the engine is running, this measurement should be 13.7 to 14.7 volts. Any readings below 11.9 volts will indicate a fully discharged battery, and damage may have occurred to the storage device. Voltage is crucial when it comes figuring out whenever a battery is still “good to go” or when a battery is “dead.” But, of course, there is more to the terms than meets the eye—and they all have to do with how much voltage is floating within the cell of the battery. Voltage is crucial when it comes figuring out whenever a battery is still “good to go” or when a battery is “dead.” But, of course, there is more to the terms than meets the eye—and they all have to do with how much voltage is floating within the cell of the battery.

The battery should maintain between 10 and 12.5 volts after a night of not being used. So is it true I should have a 12.6V reading on a fully charged battery anything less it needs to be charged? The battery voltage of a car that has been at rest should read between 12.5 and 12.8 volts. the normal voltage reading should be 13.8 to 14.5. Without the right voltage, the battery will be dead. So, around 9.6 to around 10 in voltage rating is relatively good when it comes the voltage need to help start your car battery – that is approximately the appropriate amounts of tension.
If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights. Ideally this should be done with a charger, if you don’t have a car battery charger then you can drive the car around for awhile, when the engine is running the alternator charges the battery. A meter reading of 12.2 volts or 12.0 volts will indicate a charge rate of 50 percent and 25 percent, respectively. When the engine is running, that number should be between 13.7 and 14.7 volts.
A fully charged battery should read 12.6 volts or above. The battery voltage is a good indicator of the state of charge of the battery. A good, healthy car battery should have no fewer than 12.6 volts. After you have done these, you won’t still know if your battery state if you don’t understand the outcome of the test, so. One way is to test the voltage of the battery under load, for example, with the headlights on. The voltage required to charge has to be larger than the voltage present so if the battery is at 12 v , even 12.1 volts will eventually charge . A measuring device which can only measure the state of charge of the battery is suitable to test a conventional car battery. A discharged battery will have a voltage of about 11.2 volts- … 2. It should have about 10 volts to start the vehicle. 8. At 12 volts, it drops to 25%.

With the battery in the car and the engine running at 2000rpm place a voltmeter across the battery terminals. Less than that it’s likely the engine will not start. 12.4 it is 75% 12.2 it is 50% 12.0 it is 25%

If your battery reads below the recommended voltage it must be recharged. The battery charger ammeter should start at a higher current, which should then decrease as the battery takes the charge. A perfect voltage with the engine running is between 13.7 and 14.7V. Car Battery Voltage. A car battery’s voltage is dependent on the outside temperature so assuming it’s 27 degrees Celsius, here’s what you should make of the readings you see on the multimeter display: For readings that are over 12.5 volts, it means that your battery is fully charged and it is in good condition.