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How Many Amps Is a Car Battery?

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It is a well-known fact that a car battery is one of your car’s most important components.

Therefore, you must know a lot about our car battery, namely: how many amps is a car battery?

Most 12-volt car batteries have a rating of 48 amp-hours.

This means that they can deliver one amp for 48 hours and two amps for 24 hours.

Additionally, most car batteries have a capacity of 500 to 1,000 amps.

Here, we will talk about the number of amps in a car battery, how you can check the amperage of your battery, and the number of amps you need to charge your battery.

How Many Amps is a Car Battery?

The number of amps in a car battery depends on the type and the size of the battery.

As mentioned, most car batteries have a rating of 48 amp-hours.

However, if you talk about the total capacity in amps, it comes around 500 to 1,000 amps.

Amp ratings are slightly complicated because you may find several different ratings on your car batteries.

Examples include the crank amps (CA) and the cold cranking amps (CCA). 

Amp-hours refer to the amount of time for which a battery can produce a current of one amp per hour before becoming flat.

On the other hand, Cranking amps refer to the current a battery can produce for 30 seconds at 32°F.

The third – and most important – rating, cold cranking amps (CCA), refers to the current a battery can produce for 30 seconds at 0°F. 

The amount of CAs and CCAs a battery has depends entirely on the vehicle.

How to Check Battery Amperage?

How Many Amps Is a Car Battery

It’s essential to know how to check your battery amps as well.

Luckily, you just need to follow 5 easy steps to check your battery amperage.

Step 1

Check the labels on your battery.

Often, the label on your battery will indicate your car battery’s Amp-hour (AH) rating.

The rating will state something like “12V48Ah.”

This means that the car battery is 12 volts and has a rating of 48 amp-hours.

This rating is helpful because it can be compared with the reading on the multimeter, which is used to determine what percentage the battery is charged and how long it will power your vehicle.

Step 2

Check the accuracy of your multimeter.

A multimeter is a tool used to measure electrical voltages, which you will use when finding out your car battery’s amperage. 

The readings on your multimeter should be “0” after connecting the test leads and “1” after splitting the relation.

If the readings are different from this, your multimeter is not functioning properly.

Step 3

Change the Ah settings on the multimeter.

You need to make sure that the range you set on the Ah settings matches the Ah rating on your battery label.

For example, if the rating is 48Ah, the range needs to be set between 0 and 60 Ah.

Step 4

Connect the multimeter to the battery.

This is done by plugging the metal alligator clip at the end of the black wire to the terminal labeled “Neg” or “-“ on the battery.

Then connect the alligator clip at the end of the red wire to the terminal labeled “Pos” or “+.” 

Step 5

See the reading on the meter display of the multimeter.

Match the reading with that on the label.

Note that the reading will only match the label if the car battery is fully charged.

To check your battery’s charging, you can divide the reading by the amount on the label and multiply it by 100.

You should then check how many amperes the car battery powers, divide them by the amperes in the reading, and find out how long the battery will power the electrical device.

What Amp Should a Car Battery Be?

A typical car battery should have a rating of 48 amp-hours. This implies that the device delivers:

  • 1 amp for 48 hours
  • 2 amps for 24 hours
  • 8 amps for 6 hours

How Many Amps to Charge a Car Battery?

A regular charger charges at around 2 amps.

When choosing a charger, it is recommended not to choose one that charges too fast as that may cause damage to your battery.

Similarly, you should not choose one that charges too slow either.

How Long to Charge a Car Battery at 2 Amps?

A 2-amp charger will take 24 hours to charge a car battery. 

How Long to Charge a Car Battery at 4 Amps?

When a car battery has a charge amp of 4-8 amperes, it can take between 10 and 24 hours to charge it fully.

However, if you just want to charge it enough to be able to start the vehicle, you can charge it for 2-4 hours.

How Long to Charge a Car Battery at 6 Amps?

A battery with a charge amp of 6 amperes can take around 8 to 9 hours to recharge. 

How Long to Charge a Battery at 8 Amps?

A car battery with a charge amp of 4-8 amperes mostly takes between 10 and 24 hours to charge fully.

How Long to Charge a Battery at 10 Amps?

A battery with a charge amp of 10 amperes typically takes between 4 and 11 hours to charge.

Car Battery Charge Time Calculator

If you are looking for a car battery charge time calculator, I would use this one HERE.

The webpage also gives you some good info with regards to charging a battery, amps, and more.

You will notice as you scroll, it gets very detailed in the science behind it which may or may not interested you.

Most of us just want to know how long it takes and move on!!

How Many Amps Does a Car Battery Need to Start?

Most car batteries require a minimum of 400 amps to start a car.

This, however, is for small to medium-sized cars.

Bigger cars may require as many as 1,000 amps in the car battery to start.

When trying to jump-start a car, a high-amp jumper can be used as long as the jumper has more amps than that car requires.

Jump starting involves starting a car that has a flat battery by releasing the clutch suddenly.

You can use a unit, such as a power bank, that has lower amps than your car to charge the vehicle, which will then allow you to start the engine. 


I hope you found this article discussing car amps and also how to check your car battery’s amperage.

If you interested in reconditioning car batteries, make sure you check out this post HERE.

If you found this post useful, please like and share to help us out 🙂

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