How to charge a car battery

In the days before smartphones, people didn’t need to worry much about keeping a charger handy.

But while the latest smartphones can do incredible things, such as stream live to Facebook, that is going to cost you a lot of battery.

Here are some other, less well-known reasons why you can’t leave home without your charger.

1. Signal deadspots

Network coverage is much better than it used to be, but you still get the odd dead spot.

Your smartphone is always scanning for a signal and scanning is quite a battery-intensive task.

But if there’s no signal to be had, it’s pointless letting your smartphone do all that hard work for no reward.

It’s not necessary to turn it off every time you go through a tunnel, but make sure you don’t leave your smartphone in a dead spot at night, as this will drain the battery.

2. Apps running in the background

There’s a difference between minimising and quitting an app.

Some Android users may have found that some apps simply won’t shut down at all, slowly draining battery life. The best cure for this is to download a good app-killer app.

iPhone users have a slightly easier time. Simply double-tap the home button and scroll along the multitasking menu to view apps currently running.

For those still running iOS6, to close running apps press and hold on any app until they start to quiver and hit the red X.

If you’ve updated to iOS7 simply double-tap the home button and swipe upwards on the apps you want to close.

3. You’re not charging properly

Batteries are more complicated than you might realise and there’s much confusion about how to treat them.

Metal hydride batteries benefit from being allowed to run down fully.

This means all battery cells are used equally, preferable because it means no cells are overworked to compensate.

However, the vast majority of smartphone batteries are the lithium ion type.

These don’t benefit from being allowed to charge down fully, as the lower the charge, the harder the battery has to work, increasing wear on all cells.

Keep the battery charge above 20 percent to avoid this and use the mains when convenient, as batteries only have a finite amount of charging cycles before they die.

4. You’ve got Wi-Fi and GPS enabled

If you’ve got Wi-Fi and GPS enabled, your mobile phone is always going to be trying to connect to a network.

If you’re out on a country walk or anywhere that is unlikely to have a Wi-Fi connection you’ll want to use, disable this feature.

Scanning for Wi-Fi is one of the most battery-intensive tasks your phone does: only voice calling, some games and watching video use up more battery.

5. Your phone is too hot

The surface of your smartphone acts as a heat sink, allowing the device to remain at a safe operating temperature.

If external factors, or an internal fault, prevent the phone from cooling itself effectively, it will go into protect mode.

If this happens iPhone users may see the message “iPhone needs to cool down before you can use it”.

Overheating damages the battery and leaves it is less capable of holding charge in future.

Is it possible to charge a car battery without using a charger? Yes, you can learn how to charge a car battery without a charger. You can also read more about my favorite diesel injector cleaner by reading more at this website. In many cases, the most popular method used is charging it with another car. But then, this opportunity does not always exist. Don’t worry though because you can still make use of other ways on how to do it.

While the best way is using a charging device because it is the simplest and most effective way to do it, there are other ways on which you can charge the battery if you don’t have a charger. But if there is no chance to do it because you don’t have your charging device with you, you can follow the simple methods highlighted below.

Things You Will Need

  • Resistor or a 12V bulb
  • Solder
  • Multimeter or ammeter
  • Insulating tape
  • Copper wires
  • Soldering iron

Charging at Home without a Charger

Take note of the characteristics of the battery especially the capacity and the voltage. Also, remember that the voltage is generally 12 volts, while its capacity range is from 40 to 100 Ah. It is the reason you need your power supply unit with a voltage of at least 14 volts and then between two to five ampere capacity.

  1. To do this method, you need a device with the ability of creating a specific resistance. For example, you can bring a 12V bulb or a resistor. The car battery or the power supply unit is less likely to function if you won’t use resistance.
  2. If you want to take control of the process, you should use a multimeter or ammeter into your circuit. If you’re connecting all your devices into an electrical circuit, you should use a soldering iron, copper wires, an insulating tape and a solder.
  3. Before starting, know how to get the work done. Or else, you might put your safety at risk and hurt yourself in the process. As a tip, you might as well bring your car battery to maintenance or repair center to charge the battery.
  4. When charging the car battery, you should follow the precautionary measures and the exact steps. Doing so, you can ensure that you are in control of the process. It is also done to ensure that you’re not overcharging your battery.

How to charge a car battery

Tips and Warnings

The following are basic tips to remember when charging your car battery without a charger at home.

  • Take note that there is a risk for explosion because the battery produces explosive gas while being charged.
  • So when charging with or without the car battery charger, you should have a fire extinguisher close by as much as possible.
  • You must also keep the battery away from fire sources.
  • When charging at home, you must also avoid smoking where you’re doing it. Instead, you must work in a well-ventilated space or area.

Alternative Method: Charging with a Laptop’s Charging Device

Another way on how to charge a car battery without a charger is using the laptop’s charging device. See the following for the simple steps on how to do it.

How to charge a car battery

Things You’ll Need

  • Bulb
  • Laptop’s charging device
  • Resistor
  • Copper wires

Simple Steps

  1. Strip two wires from the charging device – each for the positive and the negative wire. Take note that the positive wire must be inside and the negative outside.
  2. Attach the negative wire to your car battery’s negative output.
  3. Start connecting either the resistor or the bulb to the space or gap area. You must use a resistor here if you have it because you can change the resistance level with it.

Tips and Tricks

Be sure to gear down while driving your car at normal speed. However, you should switch off all devices that drain the battery power, and two of those include headlamps and air conditioner. Doing so, your car engine will be running at increased speed as well as your alternator’s intensity will increase. Do not do this often though because it is not good for your engine.

Also, remember that this charging method is going to increase fuel usage rate, but you can do it once as a temporary measure when no choice is left and you need to charge your car battery immediately.

Charging a car battery without a charging device is possible. Just follow the steps and tips and take note of the warnings outlined above for the best results and your safety.

Here’s how to recharge it and what to do if that doesn’t work.

How to charge a car battery

How to charge a car battery

You drove home last night and everything was fine with your vehicle, but this morning, you have a dead battery. You need to get your car going again—of course. But how? You could finagle a jump-start from a neighbor, friend, or relative. Maybe your car will keep running fine after that, but maybe not. How about recharging your battery? A great idea, but one that’s not so easily accomplished. And will it work? Is the battery completely shot, or will a recharge boost it back to life and get you on the road again? We’ll show you how to recharge it in five easy steps in the accompanying videos, but that still might not solve your problem.

How to charge a car battery

How to charge a car battery

How to charge a car battery

The best thing you can do when your battery goes flat suddenly is to figure out why and what shape it’s actually in. Did you leave the headlights on last night? Or an interior light? Either of those could be enough to run the battery down. Attempting a recharge will also help you know if you need a new battery. How so?

If the battery takes the charge and you can restart your vehicle, it might not be totally dead. But if it then dies a couple of days later, it could be either a failing battery or the fault of something else in your car’s electrical system—starting with the alternator, which supplies electricity to run the car and charge the battery. If the battery won’t even take a charge, it’s almost definitely dead and needs to be replaced.

If you’re intent on recharging your battery, you’re going to need a battery charger. There are many good ones on the market. Better still, if a friend or relative has one that you can borrow, you’re in luck. In the following videos, we use an Optima charger that we have had good experience with in the Car and Driver garage. Most auto-parts stores carry chargers and they’re readily available through online retailers such as Amazon.

Here’s How to Recharge Your Battery

First, find your vehicle’s battery and locate the positive and negative terminals. Most cars have their battery under the hood. The positive terminal is marked with a “+,” and the negative terminal is marked with a “-.” Sometimes the terminals are protected by plastic covers that need to be flipped out of the way, so you can charge the battery.

Next, make sure your battery charger is unplugged from the wall socket—it uses household current to charge the battery—and that it’s switched off, just to be doubly sure there’s no current flowing through it. Read the instructions that come with the battery charger, as each charger operates a little differently.

Attach the charger’s red clamp to the battery’s positive terminal and the black clamp to the negative terminal. Give the clamps a little wiggle to ensure that they have a good connection to the terminals. For the greatest safety, keep the charger as far away from the battery as the cables allow.

Now plug the charger in and turn it on. The Optima charger that we’re using here has a switch that sets it for either a motorcycle or car battery or one of Optima’s high-performance batteries. The Optima charger will automatically shut off when the battery is fully recharged. Other chargers work differently; they may not shut off automatically but rather have gauges that let you know when the battery is charged. Many battery chargers deliver two to six amps (some allow you to choose the amperage level) and will take at least several hours to recharge a dead car battery. Read the instructions that come with the charger to be sure you’re operating it correctly.

When the battery is fully charged, shut off the charger and unplug it. Then remove the cables, unhooking the negative (black) clamp first.

Figuring Out the Real Problem

Remember, unless you know the reason your battery died (say, because you left the headlights on overnight) even though your vehicle starts and runs after you recharge the battery, something in your electrical system may be causing the problem. Expect your battery to run down again (and be happy if it doesn’t). If your battery soon weakens or gives out, consider removing it and hauling it down to an auto-parts store. Many will test the battery for you, and you can pick up a new one while you’re there. Alternatively, jump-start your vehicle and get it down to a repair shop. You either have a bad battery or an electrical-system issue; you’ll need the help of a technician to solve the problem.

Sooner or later, most drivers encounter the inevitable inconvenience of a dead car battery. You don’t need to be an expert auto mechanic to know that without a running battery, your car won’t start at all. You’ll have to call a roadside maintenance service or find a way to get your vehicle to a repair shop in this situation. Both of these options are less than ideal.

How to charge a car battery

Alternatively, you have the option of avoiding these choices and charging your car battery yourself. So long as you have the proper equipment, like a portable battery charger, you can perform this task anywhere you need to, even when you’re stranded on the side of the road.

Let’s break down how to charge a car battery.

Prepare The Battery

Before you start charging the battery, you’ll need first to prepare it. To do so, start by determining whether you need to remove your battery from your car to perform the charge. Some car batteries must be lifted out of their holding trays, while others can be charged as they are. In most conventional vehicles, you will likely not have to remove the battery to charge it.

In the unique situation where you need to remove your battery to charge it, do so first before you start the charging process.

Turn Off All Car Electronics

Once your battery is prepared for charging (if necessary), make sure that all electronics in your car are powered down, including any accessories such as the interior cabin light or the stereo. If any electronics remain powered on during charging, the battery may experience an electrical arc during the process. Again, make sure all power and electronics have been turned off!

Remove The Negative/Ground Cable, Then Positive

Having confirmed that all power is off, you can begin to remove the negative or ground cable for your car’s battery. It’s almost always a black cable marked with a “-“ symbol. The positive cable will be red and display a “+” symbol.

Your battery may also have plastic caps over its terminals that must be pried free for you to remove the cables. If these caps are present, remove them if necessary to access the terminals.

Use a socket wrench to loosen the negative cable, then carefully pull it away from the battery. Ensure that the negative cable is situated far from the positive cable to prevent a charge from transferring between the two sources.

You’ll need to repeat the removal process for the positive cable and terminal. Move the positive cable away from the negative terminal for the same reasons described above.

Clean The Battery Terminals

Before you start charging your battery, it’s a good idea to clean your terminals. You can do so using a terminal cleaning brush, which looks similar to a small toothbrush and is used to clear away corrosive debris and dirt from the terminals. You can also use either a commercial battery cleaning solution or make your own by mixing baking soda and water.

Cleaning the terminals neutralizes battery acid and prevents malfunctions from occurring when you charge the battery and reconnect the terminals.

When cleaning your battery’s terminals, always make sure you wear face and eye protection for safety.

Connect The Battery Charger

With the steps mentioned above now complete, you are ready to hook up your battery charger.

Before beginning any of the processes noted below, please note that your charger may have specific instructions for its operation. You should follow these if they contradict our guidelines below.

Here is how you need to connect your battery charger.

  • First and foremost, ensure that the charger is powered off before beginning use.
  • Next, hook the positive cable on the charging unit up to the corresponding positive terminal on your battery.
  • Repeat the process by hooking up the negative cable to the negative terminal on your battery afterward. Do not reverse these steps – the positive cable must be connected first.
  • With both cables connected in the correct order, turn your charger on. Begin by setting it to the lowest rate by default, especially if you are using the charger for the first time
  • If your charger has a timer, set it for the appropriate charge time. This timer will charge your battery for a set time. If you don’t know how much time you need to charge your car’s battery, consult your owner’s manual or an online search.

Remove The Charger Once Charging Is Complete

After your charger has run for its desired duration and the charging process is complete, you can remove the charger’s connecting cables from your car battery. In some instances, the charger may have a meter or indicator telling you when it is safe to do so.

To safely remove the charger, make sure to power if off before touching any of the other controls on the unit. Only after the charger has been shut off is it safe to remove the cables. Once powered down, remove the positive cable first, followed by the negative.

After removing the cables, don’t forget to replace the cables on the terminals for your car battery. Again, make sure you reconnect the positive cable before replacing the negative, and be sure to use your wrenches to screw on any nuts or bolts as needed. If you removed the car charger entirely, you will need to set it back into its tray and replace the hold-down clamp.

Once reconnected, you are finished. That’s all there is to it!


Now that we have outlined the process and you’ve seen it for yourself, it should be relatively clear that charging a car battery isn’t an overly complicated task. As long as you are sure to handle the cables in the correct order and you use the proper charging equipment, your battery should be charged up in no time.

How to charge a car battery

At one point or another, you may have found yourself on the road literally stuck with a dead car battery. It is quite a frustrating experience that you do not want to happen again.

A knowledge of DIY car battery charging will be very beneficial not just for you but also for fellow motorists who are stuck in a dead battery situation.

Learn how to charge a car battery with another car—and more—as you read along.

Car Battery Charging

In this article, we will be talking about the two best DIY ways to charge your car battery—with a car battery charger and with the help of another car’s battery. Let’s start.

Use A Car Battery Charger

You ought to keep a car battery charger in your trunk so you won’t get stranded anywhere with a dead battery. To do that, you can simply hook this device into your battery, and it will be charging in no time.

Take note that battery chargers come with different settings, but that depends on their brand and model. When you purchase one, make sure that it matches the type of battery in your car. It is best to check your car’s manual to know its exact voltage.

  1. Take your battery charger, and then select the proper setting and rate for your situation and battery type.
  2. Next, determine the positive and negative terminals of your car battery. The positive terminal is usually marked with P, POS or the + symbol; the negative terminal is marked by N, NEG or – symbol.
  3. Then connect the red cable to the positive terminal of your battery.
  4. After that, connect the black cable to the negative side of the battery terminal.
  5. Then connect the charger to a power source. Use an extension cord if necessary.
  6. Wait until the battery is fully charged.
  7. Unplug the charger from the power source. Turn it off then detach the positive and negative clamps.
  8. Test the charge with a multimeter. If your battery is charged, the multimeter should read 12.6 volts or higher.

Charge With Another Car’s Battery

If you are stuck with a dead car battery, you can either ask for another motorist’s help or you can call a friend. Yes, charging a car battery with another car is possible. You will only need jumper cables and another car with a charged battery.

To charge your battery with another car, follow these steps:

  1. Park both cars in a safe place.
  2. Position the car with the live battery close to your car with a dead battery. Make sure that the two vehicles do not touch.
  3. Turn off their engines.
  4. Keep both vehicles’ hoods open.
  5. Take the jumper cables.
  6. Connect the red cable to the positive terminal of your dead battery;
  7. Link the other end of the red jumper cable to the positive terminal of the live battery; and
  8. Attach one end of the black cable to your dead battery’s negative side.
  9. Cautiously fasten the other end of the black cable to some large metallic part of your car’s engine block.
  10. Start the engine of the vehicle with a working battery. Let it work for a few minutes.
  11. Start the engine of your car with a dead battery.
  12. If the engine runs, immediately disconnect the jumper cables in reverse order.
  13. Let your car run for thirty minutes or more.
  14. Then, drive your car for another 30 minutes to recharge.

If this procedure does not work, you will need to ask for help for your car to be moved. You may want to bring it to a service center for a good charge.


Now you know how to charge a car battery with another car and with a battery charger. To avoid getting stranded with a dead car battery, you ought to have your car serviced on a regular basis. Drive safely!

Jumping in your car and hearing just a click when you turn the key is one of the worst sounds in the world! You want to get on with your day. But now the car won’t start because the battery is flat.

One of the first questions is:

Can I charge my car battery while still connected to my car?

If you can, it should be quicker and easier. But before grabbing the charger, we need to make sure it’s safe to do.

Can I Charge The Car Battery While Still Connected?

The first thing to do is to check the car owner’s manual. Any smart battery charger on the market can safely charge your car battery while connected.

In some rare cases, the manufacturer does not recommend charging your battery while connected. This is to protect sensitive electronic equipment that could be damaged by using the wrong charger.

Older chargers will supply very high charging currents that could easily damage electronic components. Modern trickle chargers only provide low current charging, which is perfectly safe. Your car battery is designed to be charged by the alternator, which supplies a low current.

The other problem with charging too quickly is that you can boil the acid in the battery.

This could force battery acid out of the vent or, in severe cases, cause the battery case to split. Battery acid is very corrosive and could easily damage anything it touches.

Find purchasing options for Smart Charger to safely charge your car battery here:

How to charge a car battery

How to charge a car battery

Pros of Charging a Car Battery When Connected

Won’t lose your radio and clock settings: If you disconnect your battery, you must reset your clock and probably enter a security code into your radio.

You may also lose all the settings in your radio, although this depends on the particular radio.

It’s easier: It’s less hassle and quicker to charge your car battery while it’s connected. You probably won’t need any tools, connect the charger cables to the battery, plug it in and wait.

Cons of Charging a Car Battery When Connected

Trickle charge only: You can only trickle charge your battery while it is connected to your car. As explained earlier, this is because a high current could damage electronics on your vehicle.

If you are not in a hurry, then this isn’t a problem.

You can’t “revive” a totally flat battery: Batteries that have gone completely flat may need a high current charge to recover them. Here, you will need to remove it from the vehicle.

In Which Cases Do I Need To Disconnect The Battery From The Car Before Charging?

If you have an older type charger

Modern chargers are microprocessor controlled and limit the charging current. The older style chargers may provide too high a current and damage the car’s electronic systems.

When your battery is totally flat

In this case, a trickle charger may not be able to charge it. This is because the trickle charger’s low current flow is insufficient to overcome its internal resistance.

For this, you need a modern maintenance type charger that can recover batteries. However, these use higher currents and pulse currents that could cause damage. So you cannot use them with a battery connected to your car.

Buy a Battery Charger with Recondition Feature online:

How to charge a car battery

NOCO GENIUS5 Battery Reconditioner

How to charge a car battery

CTEK MXS 5.0 Battery Reconditioner

When you charge an old lead-acid battery

Most car batteries are now sealed for life, but older versions vented hydrogen gas, which is extremely explosive. Charging these types of batteries when inside the engine compartment could spark an explosion.

How To Charge The Car Battery Correctly?

The best way to charge your battery is with a modern microprocessor-controlled charger. These monitor your battery while charging and adjust the charging current accordingly.

It should supply around 10% of the batteries’ capacity as a rule of thumb with an older charger. So if your battery is 100 amp-hour, the charging current should not exceed 10 amps.

Older chargers can also overcharge your battery, possibly causing damage if left connected for too long.

There are some simple tips to follow when charging your car battery:

Step 1: Make sure you have the right polarity. Don’t trust the color of any cables or battery covers on the car, but physically check the battery’s markings.

The red connector must always go to the positive terminal. The black cable must always go to the negative terminal.

Modern chargers will detect incorrectly connected cables, but older chargers may not.

Although the charger may detect reverse polarity connections, as described above, it could still damage the diodes in your rectifier.

Step 2: Connect the charger terminals to the battery first, and double-check they are correct.

Step 3: Connect the charger to the mains and switch it on.

Step 4: Now check the charger current is flowing by checking the meter or indicators.

Step 5: Once the battery is charged, switch off at the mains, then disconnect the terminals. This prevents sparks that may ignite any escaped hydrogen gasses.

Can I Start My Car While The Battery Charger Is Attached?

This depends, but the bottom line is that it’s not a good idea.

Chargers are only designed to provide a relatively low current, say ten amps max, for a standard car battery charger. When you try to start your car, the battery could be supplying 100 amps or more.

Trying to draw 100 amps from your charger will definitely blow a fuse and may even damage it. The only exception is if the battery is charged enough to supply the required current.


Finding your car has a flat battery is a real pain. You’re going to miss that important meeting or day out you were hoping to have while the battery charges.

But at least you know you can charge the battery while it’s still connected to your car. No need to get tools from the garage or get your hands dirty. Just connect the charger and wait.

One small tip, though. Find out why your battery went flat; otherwise, it will probably happen again.

You’ve turned the key to start your car and it won’t come to life. It sounds like you’ve got a flat battery. Charging your battery is easy enough to do as long as you’re careful. Check out the video or download the printable guide to get started.

How to charge a car battery

Title: How to charge a car battery

Duration: 1:24 minutes

A how to video to show someone how to properly and safely charge a car battery.

Shell Motoring Tips – How to charge a car battery – Transcript

[Background music plays]

Atmospheric, storytelling and soft background music; the same music continues throughout the video.

Screen starts with a white backdrop as the shell lock-up enters from the right of the picture while the video title text slides into the middle of the screen.

How to charge a car battery

You’ve turned the key to start your car and it won’t come to life. It sounds like you’ve got a flat battery.

Screen transitions to a page that lists the product names and pictures detailing exactly what a user will need to be able to perform the task of lubricating a motorcycle chain.

Here’s what you’ll need:

  • A car battery charger
  • Some clean rags
  • And a pair of gloves

Here’s what you’ll need. Some rags, a chain cleaner, a cleaning brush, a rear stand, some chain lubricant, a piece of cardboard and a pair of gloves.

Page transitions to a white screen with text instructing the viewer that this is the first step of the process.

Screen transitions to the inside of a car. Mechanic’s arm reaches in and turns off the key in the ignition.

Switch off the car

Make sure your car is switched off, the handbrake is firmly applied, and there is enough space around the vehicle.

Camera moves to show the mechanic from a top down angle, sitting in the drivers seat and applying the handbrake. The mechanic then exits the car, shuts the door and places the key on top of the roof.

Page transitions to a white screen with text instructing the viewer that this is the second step of the process.

2 – Check battery

The screen transitions to a close up of the inside of the engine. The bonnet of the car is up and the mechanic’s hands are visibly moving around the battery area.

Check the battery terminals

Check the battery terminals for signs of rust, dirt or damage, and clean the terminals with a clean rag if needed.

A yellow rag appears in the mechanic’s hand and he begins to lightly dust the battery and remove any dirt.

3 – Prepare charging equipment

The bonnet of the car is propped open on the left hand side of the frame. The mechanic walks towards a wheeled trolley on the right hand side of the frame, which contains a battery charger and other tools. He wheels this trolley of tools towards the car.

Put the charger in a suitable place

Now position the charger close-by but never on top of the battery.

4 – Connect battery

Connect the leads

Take the red, positive lead and black, negative lead with the crocodile clips on the ends and connect to the car battery, with the black lead attaching above the ‘negative’ symbol. Make sure the clips don’t touch each other or any other metal surface.

The camera shows the mechanic taking the ends of the leads that are attached to the battery charger, from the trolley that is situated close to the car bonnet and attaching them in the suggested order to the car battery.

5 – Charge battery

The screen transitions into another completely white summary screen in which text slides into the middle of the shot from right to left that states the sign off caption:

Switch on the power

The camera angle is from a personal view in front of the mechanic’s body. A plug socket and a plug appear and the mechanic places one inside the other to start the flow of electricity. The green light on the battery charger turns on.

Now switch on the power at the mains. Check the battery charger manual so you don’t leave it charging longer than required.

Find the battery indicator

The mechanic places the plug onto the floor gently and then picks up the battery charger – taking one side in each hand. The battery charger appears front on to the camera and a green light can be seen next to the ‘charging’ sign.

On the charger, there should be an indicator that shows when the battery is fully recharged. Once this is lit, switch off the charger. You’re now fully recharged and ready to get back on the road.

The mechanic places the battery charger back down onto the trolley to wait for it to charge fully. The trolley sits to the side of the car with it’s bonnet still open. The frame transitions to the white divider screen.

  1. Get ready
  2. Check battery
  3. Prepare charging equipment
  4. Connect battery
  5. Charge battery

Here’s to better journeys

The final transition is to a white screen with the Shell Pecten already present in the middle of the shot. The Shell Go Well caption slides in from left to right, sitting under the logo at the centre of the screen.

How to charge a car battery

Charging your vehicle’s battery is a much more efficient way of keeping your car running than jump-starting it once the battery has gone flat. It’s also much better for your battery in the long term.

Thankfully, with a battery charger to hand, it’s not too difficult to do it yourself. Just follow the simple steps below.

Check your charger

Always make sure you’ve read the operating instructions on your specific charger, and make sure that it’s fit for purpose.

If your vehicle has Stop/Start Technology, it will be fitted with either an EFB (Enhanced Flooded Battery) or an AGM battery (Absorbent Glass Mat), so you’ll need a smart charger to charge these types of battery safely.

Before you start charging, ensure the battery terminals are clean and free from corrosion. If not, clean the terminals before charging, as this helps to ensure a good connection.

Get connected

With that prep work done, you can now connect your charger to the battery. Some manufacturers may advise disconnecting the battery during charging, so always check your owner’s handbook before you continue and follow their recommendations.

Ensure the charger is switched off, then you should connect the red positive (+) lead to the positive (+) terminal on your battery. Always connect the black negative (-) lead to the negative (-) terminal on the battery last. Ensure the charger is situated away from the battery and switch the charger on to commence charging.

Keep a close eye on the charger, and once your battery is fully charged, switch the charger off and disconnect it from the mains. Make sure you disconnect the negative lead first, then the positive lead last.

And that’s it. Your vehicle should be charged and ready to go.

If you need to charge your battery, you can find battery testers and chargers on the Green Flag Shop.

How to charge a car battery

Scott Wilson is vehicle and customer data insight manager for Green Flag.