How long does it take to charge a car battery? What you need to know

The worst scenario for any vehicle owner is a dead battery. Your automobile probably won’t start most of the time because your battery is dead. Vehicle batteries supply the power needed to start the engine. The battery is then recharged as you drive by the alternator after that. Many individuals don’t realize how long it takes to recharge a battery. While you drive the car, the battery usually recharges itself automatically. But the question is how long does it take to charge a car battery? Actually, charging a car battery takes four to eight hours at highway speeds. While you’re driving, it won’t ever reach 100%, though.

How long does it take to charge a car battery?

A car battery can, however, occasionally discharge for a variety of causes. Perhaps it’s time to charge your car’s battery. Idling the automobile or using a trickle charger are the two methods used most frequently to charge the battery. Turning on your car and letting it idle is the easiest approach to recharge because it doesn’t call for any additional equipment. Nevertheless, keep in mind that if you want your battery to fully charge, you’ll need to let your car idle for several hours. Make careful to switch off any other energy-consuming devices in the vehicle before doing this, such as the radio, lights, air conditioning, etc.

Today, we’ll get to be discussing the answers to the following questions:

  • How long does it actually take to charge a car battery?
  • What are the signs and symptoms that your car battery needs charging or replacing?
  • How long does a car have to run to charge a dead battery?
  • What are the charging times with different battery chargers?
  • How much does it cost to charge a car battery?
  • Which car battery is best to use?

Read more: Lists of best car battery charger

Ok then, let’s get to it.


How long does it actually take to charge a car battery?

A typical automotive battery may be fully charged in 2 to 4 hours using a 20 Amp charger, and in 12 to 24 hours with a 4 Amp charger. Another vehicle can be used to jumpstart the battery in your car. Idling is another method for charging the battery if you can get it started.

The actual charging time for a car battery is between 10 and 24 hours. These are fast, efficient chargers. If you’re utilizing a trickle charger, your battery may need to be charged for three or more days. Slow charging protects the battery. A car battery has 48 amps; therefore, divide 48 by the charging rate to get the number of hours it will take, depending on how many amps your charger has.

For instance, if your charger charges at 6 amps per hour, charging a battery to 100% charge will take 8 hours. However, let’s examine if your battery is worth rescuing before you connect a charger. First, since batteries typically last 4 years, if your battery is older than 3 years it might be worth replacing. But keep in mind that a fully dead battery may be permanently ruined and may leave you stranded once more.

Read more: How to recondition a car battery

What are the signs and symptoms that your car battery needs charging or replacing?

Here are the most common signs and symptoms that it’s time to charge or replace a car battery:

  • Your car has trouble starting.
  • The vehicle’s start-stop system malfunctions.
  • You have a battery that is over five years old.
  • The car’s electrical system is losing power.
  • Your dashboard’s battery warning light illuminates.

Your car has trouble starting

We’ve all undoubtedly felt that sinking feeling while trying to start our vehicle and it splutters and growls back at you at some point or another. Your battery needs to be charged if your automobile won’t start with a single turn of the key (or push of a button). Investing in a battery charge, such as those in the new CTEK line, is a far easier method to deal with the issue than continuing to try to start the engine and then, if you are successful, setting out on a journey of at least 30 minutes to give your battery enough time to charge (more on that below).

The vehicle’s start-stop system malfunctions

Your battery can be monitored by start-stop systems, which can also measure the amount of electricity being extracted from it. In order to prevent the battery from being so severely discharged that your car won’t actually start, the system may disable the start-stop function if it detects that your battery is having trouble. Once more, the winter months present more of a problem because your battery is under additional stress from your heater, lights, and wipers. And once more, a battery charger can be used to solve this problem. Make sure to pick a type of charger, like a smart charger, that works with start-stop batteries.

You have a battery that is over five years old

Although most automobile batteries are made to last between five and seven years, a battery that is having trouble may simply be an indication that it is nearing the end of its useful life. The date that the battery was made, which is stamped on the battery, can be used to determine how old it is.

The car’s electrical system is losing power

It’s likely time to charge your battery if your windows, lights, heater, or other electric devices respond slowly or suddenly lose power. This kind of issue is more likely to be present during the colder months when you use more of your car’s electrical systems, such as the lights and heater, and your battery has to work more to keep everything running. Once more, this is a circumstance in which a battery charger would be really helpful.

Your dashboard’s battery warning light illuminates

If your dashboard displays that annoying battery icon, it indicates your alternator, battery, or electrical system may be malfunctioning. All of this indicates that your car won’t be effectively charging itself while you’re driving, and you’ll likely experience a flat battery at some point in the future. In either case, you should have your car checked by a professional.

Read more: Lists of best car battery

How long does a car have to run to charge a dead battery?

You can let your car’s alternator charge the battery for you if you jumpstart it. The size of the vehicle battery and the size of the car engine has a significant impact on how long it will take your automobile to charge the battery. The alternators in cars are subject to a wide range of impacts, delivering anything from 30 to 150 amps.

When charging a car battery, the engine’s RPM is also important because a faster-spinning alternator makes charging more difficult. Expect it will take a few hours to fully charge your car battery using your alternator. Nonetheless, it is usually advised to use a car battery charger as opposed to the engine to charge your dead car battery.

Read more: Understanding Single-use and Rechargeable Batteries

What are the charging times with different battery chargers?

What are the charging times with different battery chargers?

The amount of power that various vehicle battery chargers provide varies, thus this will have a significant impact on how long it takes to charge a car battery. Of course, different types and sizes of batteries require varied amounts of time to charge, but a typical automobile battery can take about 62 Ah at times. The time required to charge an automobile battery is as follows:

  • 2 Amp charger: 24 to 48 hours
  • 4 Amp charger: 12 to 24 hours
  • 10 Amp charger: 3 to 6 hours
  • 20 Amp charger: 2 to 4 hours
  • 40 Amp charger: 30 minutes to 1 hour

Read more: How to properly recycle or dispose a battery

How much does it cost to charge a car battery?

Your battery can cost between $10 and $20 to be charged at an auto repair shop. But, if the battery is damaged, you’ll need to buy a new one to swap out the damaged one. Standard lead acid batteries are easier to install and take less time, therefore a repair shop may charge $5 to $10 to do so.

Read more: List of best places to buy cheap batteries for cars

Which car battery is best to use?

You must first determine the kind of battery charger you require. Perhaps you require a quick charger or just a maintenance charger. Even though modern chargers are simple to use and have battery charging monitoring, which controls the amps themselves, you should still check to see how many amps it can handle before purchasing one.

Inexpensive chargers frequently offer more amps than they can actually deliver. It is preferable to use a high-quality charger with fewer amps. Both your car battery and the chance of damage to it will be preserved. The CTEK charger is a battery charger for cars that I would highly suggest.

Read more: Lists of best battery maintainers


How long does it take to charge a completely dead car battery?

It will take roughly 10–24 hours to fully charge a standard automotive battery with a usual charge amp of 4–8 amperes. It would take about 2-4 hours to sufficiently charge your battery so that you could start the engine. Recharging slowly is the best strategy to ensure that your car battery lasts a long time.

How do you know when a car battery is fully charged?

You’ll need a voltmeter to check the voltage; they are reasonably priced and available at most of the major auto parts retailers. Use the voltmeter to measure the battery voltage to assist you to decide what to do next. Your battery is healthy and fully charged if it is 12.6 volts or above. No other action is required.

Does idling a car charge the battery?

Yes, your car’s battery will begin to charge as long as the engine is running, to answer your question simply.

Will a car battery recharge itself overnight?

No. There is no way for a dead automobile battery to recharge. You might take it outside to charge it or jumpstart it using a different battery or another vehicle. There isn’t a car battery out there that can charge by itself without help.

Can a dead car battery still be charged?

There are ways to fully recharge your battery if it is entirely dead but has been given a jump start. As was already explained, the first is by driving around. But, automotive battery chargers can regenerate the entire charge into a battery if that doesn’t seem to be working.

How many times can a car battery be recharged?

Depending on driving and weather conditions, most car batteries have a lifespan of three to five years or between 500 and 1,000 charging cycles. Your car battery won’t last forever, but you can make it last as long as possible by taking good care of it.

How far do you have to drive to charge a battery?

Driving for at least 30 minutes at highway speeds is required to acquire a full charge from a trip. 30 to 40 miles approximately. To gain power, you can also let your automobile idle, but it will take much longer.

How long should I let my car run after a jump?

After you jump-start the automobile, it’s advisable to drive it about or let it idle for at least 30 minutes. For the alternator to properly charge the battery, you should ideally drive the automobile for 30 minutes.

What can drain a car battery when the car is off?

When a car is not in use, factors like interior lights, door lights, or even faulty relays can deplete the battery. You usually don’t have to worry about the battery dying while you’re playing the radio on your commute to work because the alternator recharges it while your engine is running.

What should you not do after you jumpstart a car?

Your automobile won’t charge as rapidly if you leave it idling. Your car should restart within 30 minutes, and each subsequent drive will keep it charged.

Do I need to replace a battery after the jump-start?

In order to prevent recurrent failure, your battery will probably need to be replaced if it is three or more years old. While a jump start might help you get it moving again, the factor that caused its initial breakdown is still endangering your battery’s life. Unless you obtain a replacement, it probably won’t stop dying.

That is all for this article, where we get to discuss the answers to the following questions:

  • How long does it actually take to charge a car battery?
  • What are the signs and symptoms that your car battery needs charging or replacing?
  • How long does a car have to run to charge a dead battery?
  • What are the charging times with different battery chargers?
  • How much does it cost to charge a car battery?
  • Which car battery is best to use?

I hope this content was helpful. If so, kindly share it with others. Thanks for reading; see you around!