How Long to Charge a Car Battery with 4 Common Ways

Jerry Wilson
Written by
Last update:

How Long It Takes to Charge a Car Battery

The correct way to charge car batteries depends on the type of battery. Most modern cars are designed to have sealed batteries, meaning you won’t be able to access the battery cells, and you can’t simply fill them with water or replace the battery.

Sealed batteries are obvious in appearance due to their black casing.

Therefore, when you purchase a sealed car battery, you need to read the operating and charging instructions that are listed on the label.

If you don’t do this, you will need to charge the battery for several hours. The time it takes for the battery to be charged depends on several factors.

The first factor is the amount of power that the battery currently holds. The weaker the battery is, the longer it will take to charge. The battery can be recharged with just a few hours of charging time, but it will most probably still be weak.

If you do charge the battery for a long period of time, you should do so with a charger designed for sealed batteries.

The second factor is the charger itself, so it’s wise to buy a high-quality battery charger that is specifically designed for charging car batteries.

Factors that Affect Car Battery Charge Time

Car batteries perform the same function as a battery in any other device. But it also has some special features because it’s designed to start your car.

For this reason, the standard “AA” battery in your flashlight doesn’t work in your car. It needs to be able to start your car engine, jump your car battery, and maintain power for ignition. To do all of this, it has a large amount of power and a high starting voltage.

Because of this, car batteries also have a different charge time than other batteries. So when you need to charge your car battery, you have to know how long it will take.

For example, if you car battery is drained, you may be able to recharge it in as few as 30 minutes. However, if it’s just draining, and not completely dead, it could take several hours to fully recharge.

Battery charge time varies based on the following factors:

  • Charging method
  • Charging speed
  • Battery capacity
  • Battery state of charge (SoC)
  • Battery age
  • Battery temperature

How to Recharge a Battery Optimally

Car batteries are rechargeable, which means that they can be run down but also recovered over and over. The battery behaves differently depending on how you have been using it.

If you have been regularly driving the car and only occasionally charging the battery, it is already past its prime. If you have been using the battery regularly and recharging it, then it is the right time to replace the battery.

If you wait too long to replace the battery, you won’t be able to use it any more. A battery’s optimal time to be charged is between 13.7 and 14.6 Volts. The reason it gives this as its optimal charging voltage is that the battery has most of li-ions extracted and extracted back in when the voltage is at 14.5 Volts.

The more stressed the battery life is, the more often it must be charged for optimal results. This is because stressed batteries produce much less power than they should. So you may need to charge your battery for multiple hours in order to bring up the voltage enough to store sufficient amount of power.

Remember, only charge the battery if you need to. To recover the battery from its usage, which means to bring it back to a charged status, you need four hours. If you need to bring the battery up quickly, then you will need to leave it over night to do so.


So, as you can see, there are a plethora of different charging methods for a car battery. It all depends on your needs and situation.

You can take the guesswork out of charging a car battery by using a battery charger with a feature called “manual mode.” In manual mode, the charger keeps your battery in top condition, and you get peace of mind knowing that you’re not harming your vehicle in the process.

Remember, if you ever need to charge your car battery, check your owner’s manual to see what it says about its optimum charging voltage. You can easily maintain your battery without having to pay a mechanic. Now that’s one less bill you have to worry about!

Now you know the answer to the question, “how long does it take to charge a car battery?” But what about the next question, “how long does it take to charge electric vehicle batteries?”

Or maybe you’re more interested in the “how long does it take to charge a golf car?”