How long does it take to charge a car battery

If you are a car owner or a car driver then it is obvious for you to know How long does it take to charge a car battery.

In your car, the engine, as well as the car battery, is an important component in operating and running your car. Besides providing electricity to the electrical devices of your car, the battery helps to start the engine, delivers electricity to the ignition system, works with an alternator to power other electronics of your car, regulates the voltage by which the engine converts electrical energy to mechanical energy.

So, you should know how to take care of your car battery for long and good performance. Well if there is a battery, then it needs to be recharged. And the most important question is how long does it take to charge a car battery. This article will answer all sorts of such questions you may have.

How long does it take to charge a car battery

The average life expectancy of a car battery is around 4-5 years. Its longevity depends on a number of factors like type and age of your car battery, weather condition where you keep your battery to sit, turning on or off the electrical gadgets when leave your car, regularity of your car driving, etc.

However, when you start your car and it gives no response, you get to know that your car battery is drained. If you have a standard charger, it will charge your battery in 1hr-4hrs. Or you need a jump starting in case of emergency. But how long time you prefer for charging?

Obviously, you prefer quick charging. But that may damage the battery and reduce its working performance.

It is quite safest to charge your battery slowly. The duration of charging a car battery depends on mainly two factors

The battery and the charger – The conventional battery is not suited to cold weather as your car battery loses its power rapidly and finally becomes freeze at such temperature. In this case, the higher Cold Cranking Amps (CCA) battery of a good brand is suitable for combating cold weather.

The high amps charger charges your battery quickly. As an example, 40amps charger charges in 1-2 hours whereas 2 amps charger needs 24 hours to fully charge.

The following are 3 types of car battery charger from which you can choose as per your requirements:-

  1. Linear Charger :- It is the simplest charger but not fastest. Your battery is charged at a low amperage. It takes about 12 hours to complete charge for a moderate battery. The another disadvantage is the charger supplies power continuously unless disconnect it .So, there is a chance of overcharging that may damage your battery and excessive overcharging causes explosion.
  2. Multi Stage Charger :- It provides fastest battery charging in burst instead of continuous stream of linear charging. It hardly takes 1 hour to full charge a flat battery.
  3. Trickle Charger :- It provides safest way of charging to your car battery for a long time. It is 2amps charger and therefore, your battery is charged slowly. The main advantage is that it stops automatically when full charged. So, you can easily plug this charger with your battery without worrying about overcharging for a long time.

How long does it take to charge a car battery while driving

How long does it take to charge a car battery

If you drive your car regularly, the problem of draining the charge of your battery can be diminished by charging your car battery through driving. Most of the time you will face battery-related problem in cold weather that’s why if you have the best car batteries for cold weather then it can be the perfect solution in cold weather

The alternator flows AC energy from the engine to the car battery till fully charged during driving. After full charging, the excess current goes to the other parts of your car.

Thus your battery is safe from damage due to overcharging. Here, the question may come to your mind that how long does it take to charge your car battery while driving?

If your car battery is of a good brand and your car runs on a free highway, it takes around half an hour or an hour for full charging by driving.

The factors controlling how long does it take to charge a car battery while driving are depends on few factors that are

  • The last time you have charged your battery
  • The level of charge of your car battery, your driving style, and
  • how long you drive your car.

If the charge level is low, you should drive long-distance of at least 55 miles at a constant speed to increase Resolution Per Minute (RPM) to 1000. RPM is a measurement of the rotation of the engine’s crankshaft in a minute.

It simply means the more it rotates, the faster it will charge. So you have to drive a long free motorway for fast charging. But driving in the city takes a bit long time because you stop your car many times.

The duration of driving is also an important factor for charging. A short trip can hamper your battery because it has no enough time for full charging.

Frequent recharging and discharging invite the dying of your battery. Driving for more than 1-hour charge your battery properly and bring the excess charge to other devices of your car.

How to revive a dead car battery

How to revive a dead car battery

If your car is sat for a long time, it’s battery is prone to dying because the remaining charge stored in the battery operates your car’s electrical and the other monitoring systems even your car is idling at garage.

The driving car has been stopped in COVID-19 pandemic and the problem of dead car battery is common. But there are several way-outs to revive your dead car battery and this article will show you how to revive a dead car battery.

First of all, you should know how to determine your car battery’s longevity. It depends on how much it is used and the quality of your battery.

If used regularly, your battery will last upwards of 7 years. Most maintenance free batteries tend to work 4-7 years. Short car battery lasts 3-4 years. Apart from these, lack of use, deep cycling of battery(several times of recharging and discharging), electrolyte evaporation, battery cell damage, charging problems reduce span of your battery. If your battery is sat unused for a month or more than that, it may drain all charges and become dead.

Some processes of How to revive a dead car battery are suggested below –

  1. Epsom salt :- When your battery is suffering from low electrolyte level, use Epsom salt solution as electrolyte solution of your car battery. Epsom salt (Magnesium Sulphate) is a strong acid made of variety of hydrates that help in keeping chemical balance and bringing charging capacity to your dead battery. To prepare the solution , dissolve 1 part Epsom salt with 3 part warm distilled water. The warm solution is recommended because it speeds up the process. Then, fill each cell unit till the plates are covered by 1/4 to 1/2 electrolyte solution.

2. Aspirin Solution:- Aspirin (acetylsalicylic acid) is another chemically active solution that can be used as alternative to your electrolyte mix in your battery. Crush 12 aspirin tablets (350mg-500mg) and dissolve this powder in 6 oz. warm distilled water. Then add it to each cell unit. It may take extra water.

3. Distilled water:- If you don’t have Epsom salt and aspirin ,you can use distilled water as electrolyte booster of your car battery. It will give more reaction in a few more turning of engine if the plates are submerged in distilled water.

4. Jump start :- A jump start, second battery or boost, can be used for reconditioning of your dead car battery. Connect your dead car battery to the charged battery of another vehicle or to 18 volt drill battery. You can buy this battery from auto shops. Don’t jump-start a frozen battery because it could explode. Firstly thaw it and then attempt to jump start.

If the above methods do not work, consult a professional or buy a new branded car battery. The article has shown you some tips to prevent your battery from untimely demise –

  1. Drive regularly so that the alternator keep your battery charged at optimum level. At least run your car once in a week.

2. If your car is sat for an extended period, charge your battery with a trickle charger.

3. Don’t let your car sit in hot and cold temperatures. Park your car in a shaded area of a garage.

4. Avoid deep cycling.

5. Consult a professional to check the function of charging system.

How to keep car battery charged when not in use

How to keep car battery charged when not in use

When you drive your car regularly, the alternator keep your battery charged. But, when your car is sat for a long time, the battery is more prone to draining and then dying. To prevent dying ,you have to know how to keep your car battery charged when not in use. The following steps will show the way outs :-

  1. Turn off electrical devices like AC, radio, Bluetooth, fan-light, alarming system when leaving your car. If turned on , these consume all powers stored in your car battery.
  2. Excessive heat causes to dry battery fluid or electrolyte mix resulting into damage of internal structure of your car battery. So, park at a cool shaded spot. In case of cold temperature, it slows down the reaction of solutions of battery for which your car does not get enough energy to start or run. Therefore, CCA battery is best for combating cold weather.
  3. Avoid short trips because the battery does not get charge properly that could invite sulfation to your car battery.
  4. Clean your battery from dirt and debris on a regular basis because it removes the power draining grime. Prepare a mixture of baking soda and distilled water and apply it with a clean towel or spray bottle or brush dipping into the solution.
  5. Buy a standard battery charger to recharge your battery while your car is not in use. Remember fast charging overheats to your battery. A trickle charger is the safest one that charges your battery slowly and automatically stops when fully charged.
  6. Start your engine once in a week to let the alternator produce current for battery charging.
  7. Appoint a professional to make sure whether your car battery system functions properly or not.

How long to idle car to charge battery

IF you want to know How long to idle car to charge battery then read our following points

You will be surprised to know that your car battery is not only recharged from driving but also from idle condition. As soon as the engine is on, the alternator transfers power from engine to your car battery.

The duration of charging depends on a number of factors like the quality of the battery, the last time you have changed, the number of electrical devices in car, and how much voltage the alternator produces.

Generally, 10-15 minutes is sufficient for complete charging for an idling car. But this is not an effective way to charge your car battery. After operating the electrical system of your car, a low amount of current remains to charge your battery during idling.

When your car is idling, if any high electrical device of your car is left on, all current of your alternator will drain. Driving for at least 30 minutes is effective for charging your car battery at idling.

As the mechanical action takes place with the engine crankshaft, the alternator produces AC current and transfers it to the battery while your car is idling.

If the battery is branded, a flat battery is recharged by 80 percent within 2 hours by idling. But it is not suggested for effective charging of your battery as idling does not allow your battery to be fully charged as maximum power is not produced by this.

How long can a car battery sit unused

If you leave your car at garage for days, you will want to know how long can your car battery sit unused before it goes flat and what are the preventions to take before its dying.

A sited battery can last depend on so many factors- age of your car battery, quality of your car battery, number of electrical components in your car that drains the power of the battery.

If your car battery is new, branded and kept in good condition, your sitting car battery will last for around two months.

An old battery goes flat quickly than the new. How long can a car battery sit unused depends on the quality of battery also matters as a 90-day warranty battery goes flat quickly whereas a 4-year warranty battery lasts long and also holds a charge for a long when unused.

If there are more electrical devices, your car battery cannot sit unused for so long because of the draining of the remaining power stored in the car battery.

Modern cars are equipped with multiple electrical components like clock, radio, Bluetooth, alarming security systems that consume a lot of power stored in the sited car battery.

To prevent quick draining of your car battery and to extend the sitting period of the battery, you can follow the steps below-

  1. Charge your car battery with trickle charger while it is unused. Trickle charger is the safest mode of charging because it charges slowly and automatically stops when fully charged.
  2. Make sure you don’t turn on the headlight, lights, radio before leaving your car at garage.
  3. Frequent charging reduces your battery’s performance. So, alternatively run your car engine for 30 minutes once every week to let the alternator charge your car battery.
  4. Don’t keep your car at hot or cold temperature.


We all know that maintaining your car is very low and you will not have a problem with it. So I think after reading this article then you have understood that you must drive your car on a regular basis then I think you will not face any problem of charging a car battery.

So driving your car on a regular basis will help you to charge your car battery. If you allow your car to sit for long periods of time then you may face a battery-related problem.

To get a good performance from your car battery you must clean the plugs of your car battery with hot water so that sulphur does not fall on your car battery after that use a little bit of cold creams on the plugs.

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