How Long To Charge Car Battery? This kind of question comes up when the driver is in a haste. The car battery is drained. You have a car battery charger in your garage, but how long does it take to charge a car battery? However, if you are eager to know the correct answer to the above question, you are in the right place. This Write-up will unveil everything you need to know.

How Long To Charge Car Battery

Charging a car battery is not the same as charging your phone battery. It may sound so simple (charging a car battery); however, there are many tricks to save your battery and give it a longer lifetime!

How Long to Charge Car Battery

On a general note, charging a car battery will take 2 to 4 hours, for a car battery with a 20 Amp battery charger. And it will take 12 to 24 hours with a 4 Amp charger. However, the charging time strictly depends on the car battery and the charger’s power output.

This simply means you will have to check your car battery charger to find out how much ampere it’s giving out. Chargers with high amperes charge your car battery faster. Low ampere is best for maintenance charging of your battery over long periods.

Moreover, in other to know how fast your car battery will charge, you also have to look at the size of your car battery and the battery type. Mostly, a mid-sized car uses a battery of the size 40-80Ah. You also need to know the kind of car battery. An AGM/GEL battery can charge up a bit faster than a regular wet battery.

Charging Times For Different Battery Chargers

Different car battery chargers have unique or different amounts of power, so the charging time of a car battery will depend a lot on this. Though, there are times for a normal-sized car battery around 62 Ah.

Below is the list of how long it takes to charge a car battery:

For 2 Amp charger –  24 to 48 hours

4 Amp charger – 12 to 24 hours

For 10 Amp charger – 3 to 6 hours

20 Amp charger – 2 to 4 hours

40 Amp charger – 30 minutes to 1 hour

What Is The Best Speed To Charge A Car Battery

The speed of your car battery charging should be based on what you want to get. Fast charging can damage your battery and will make it not last long. Long-time charging with low amps is the best option for keeping the battery’s lifetime long.

Mostly, a standard car battery charger is offering about 4-15 amperes. While 2-4 ampere is basically for maintenance charging. So, it will take around 24 hours to fully charge a dead battery at this load.

Furthermore, you can check your car battery charger for any settings for the charging rate and apply the charging rate for your needs. To avoid damaging your battery while charging it faster, please charge it at the rate of 8-15 amperes.

What causes a battery to go flat?

There are many reasons why your car battery may go flat. However, in most cases, a flat battery occurs when you forgot a light or something similar in the car before leaving it.  It can also be a problem with some electrical consumer that does not want to turn off when you turn off the ignition. Another reason for a flat battery is when the battery is bad.

How Long Does a Car Have to Run to Charge a Dead Battery?

If you jump-start, you can also allow your vehicle’s alternator to charge the car battery for you. How long it will take for your car to charge the battery will depend mainly on the car engine and the size of the car battery. Vehicles have very different effects on the alternators, giving everything from 30 to 150 amperes.

However, the engine’s RPM also matters when charging a car battery because the alternator is charging harder when it is spinning faster. So, if you want to charge your car battery fully with your alternator, you can expect it to take some hours.

Which Car Battery Charger Is Best To use?

To find out the best charger for your vehicle battery firstly, you will have to figure out what type of battery charger you need. Decide if you need a fast one or just a maintenance charger.

However, Modern chargers are easy to connect and have battery charging monitoring. This will regulate the amps themselves. Don’t forget to check to see how many amps it’s charging with before buying one.

Cheaper chargers mostly promise more amps than they charge with. So it’s best to choose a quality charger that gives lower amps instead. It will not only save your battery, but it will also minimize the risk of damage to your vehicle.

Why not check out the CTEK chargers. They have several sizes of chargers for your needs, and it’s a well-known brand probably making the best car battery chargers on the market. To find out more about their charger or to make purchases visit


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