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A car battery won’t last forever, even with proper maintenance. If the headlights are dim, the car needs to start outside because the battery is dead, or the battery is more than 3 years old, it’s time to replace the battery. Fortunately, battery replacement is easy and you can do it yourself with just a few basic tools.
Steps
Remove the old battery
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Park the vehicle on a flat surface and turn off the engine. Avoid changing batteries on the side of the road if possible. Find a safe place to work, away from traffic, sparks, open fire, or water. Set the handbrake and turn off the engine. Remove the key from the switch to make sure no electricity is entering the battery. [1] X Research Source
- The garage or front entrance is a safe place to change the battery. The place to change the battery needs to be well ventilated (open the garage door).
Tip: Removing the battery will return the clock, radio, locator and alarm to their original settings, so you need to know the alarm’s code before you begin. If you don’t remember, you can refer to the user manual.
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Wear protective gear and open the bonnet. The battery contains an electrolyte solution of sulfuric acid, which is highly corrosive, can burn the skin, and releases flammable hydrogen gas. You should wear insulating gloves and safety glasses to protect yourself. Open the bonnet and lift it up with a cane if necessary. [2] X Research Source
- Remove all metal jewelry, such as watches or rings, to avoid electric shock.
- Wear old clothes so you don’t have to worry about getting greasy.
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Locate the battery. The battery is usually located in a corner of the engine bay, near the windshield or the front bumper, on the left or right side of the vehicle. Find a rectangular battery box with 2 cables attached to it. If you have a newer car, the battery may be under the plastic cap, so you’ll need to remove it if you have one. [3] X Research Sources
- See the user manual if you can’t find the battery.
- Note that in some vehicles, the battery will be in the rear trunk instead of under the bonnet.
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You will first remove the negative cable and secure it in place. Always remove the negative cable before the positive cable to avoid short circuit. The negative electrode of the battery is usually black and marked with a minus (-) nearby. Remove the plastic cap if present, then loosen the negative cable clamp with a wrench and pull the cable away from the electrode. [4] X Research Sources
- Secure the negative cable to the engine compartment with a tie wire, making sure it doesn’t come into contact with anything metal.
- Depending on the vehicle, you may need to use a 7-mm, 8-mm, 10-mm, or 13-mm wrench to remove the cable. However, if the battery terminal has a clamp that supports quick opening and closing, you do not need to use a cable remover.
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Next, you will remove the positive cable and secure it in place. The positive electrode is usually red and marked with a plus (+). Remove the plastic cap on the electrode if present, then use a wrench to loosen the positive cable clamp and pull the cable away from the electrode. Tie the fixed cable to the engine compartment. [5] X Research Sources
Warning: Make sure the negative and positive cables do not touch each other and do not let them come into contact with anything metal, as this could cause a dangerous short circuit.
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Remove the accumulator. Check the battery holder bracket and remove all screws connecting the battery to this bracket. You may need to use a properly sized pipe wrench, and an extension rod. After removing all the screws, lift the battery out of the engine compartment and set it aside on the concrete floor. [6] X Research Sources
- Batteries usually weigh about 10kg, so you should ask someone else to help you if you can’t lift it yourself.
Install a new battery
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Clean corrosion products on battery electrodes. Check for powder build-up on the electrodes, which are green, blue, gray or white. Use an emery cloth or 100-grit sandpaper to clean the corrosion product on the electrodes. [7] X Research Sources
- Remember that the acid in the battery is corrosive, so do not let it get on your skin or clothing.
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Buy the correct replacement battery. Take pictures or record information on old batteries, such as size, size and number. Go to an auto parts store and provide this information to the salesperson along with the year, make, model, and engine size of the vehicle. They will help you find the right battery. [8] X Trusted Source Consumer Reports Go to Source
- Car batteries come in many sizes and capacities, so you must buy the right one for your vehicle.
- If you live in the US, you should bring your old battery to the store. Some auto parts stores allow you to exchange your old bottle so you don’t have to pay a fee for recyclable parts.
- If the store doesn’t accept the old battery, take it to a recycling center for disposal. Do not throw it in the trash because the battery contains corrosive material.
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Fix the new battery to the bracket and lubricate the electrodes. Place the new battery in the bracket and secure it with screws. You only need to reverse this process to remove the battery from the bracket. Then, coat each electrode with a thin layer of lithium grease to prevent corrosion. [9] X Research Source
- Make sure the new battery is installed in the same direction as the old battery.
- You must tighten all the screws on the bracket so that the battery does not shake or move when the car is running.
- Do not spray lithium grease on any other part of the engine other than the positive and negative electrodes.
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Connect the positive cable first. Remove the positive cable that is being tied to the engine compartment, being careful not to let the end of the cable touch anything metal. Place the cable over the electrode and tighten it with a wrench. Close the cap on the electrode if the battery has a cap. [10] X Research Source
Warning: When reconnecting a battery, always attach the positive electrode before the negative electrode to avoid accidentally closing the circuit before everything is connected.
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Next you will connect the negative cable. Repeat this procedure by removing the cable tie and attaching the negative cable to the negative electrode. Tighten the clamp with a wrench and make sure that the wrench and negative cable are not in contact with anything metal, as this can cause a very dangerous discharge. [11] X Research Source
- If the battery has a plastic cap, install it.
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Close the bonnet and start the car. Remember to remove all tools from the engine compartment and close the bonnet. If everything is done right and the battery is really the cause of the problem, the car should start up normally again. Enter the code of the alarm device if necessary. [12] X Research Source
- Check to make sure all electronics are working properly, then reset the clock, radio, and navigation system.
Advice
- Wear old clothes so you don’t have to worry about getting dirty.
- The battery in some vehicles is mounted in the trunk instead of under the bonnet.
- Some large vehicles have multiple batteries, and are sometimes placed in different locations.
Warning
- Do not place the battery on its side or upside down.
- Avoid working in wet conditions.
- Do not leave metal objects on the battery because the 2 electrodes can connect and cause a short circuit.
- Remove metal jewelry before replacing the battery.
- Wear insulating gloves and safety glasses.
- Never connect 2 battery terminals.
Things you need
- Insulated gloves
- Safety glasses
- Wrench 7-mm, 8-mm, 10-mm, or 13-mm
- Cable ties
- Pipe key
- Extension rod
- Sandpaper or 100-grit . sandpaper
- New battery
- Lithium grease
X
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 3,048 times.
A car battery won’t last forever, even with proper maintenance. If the headlights are dim, the car needs to start outside because the battery is dead, or the battery is more than 3 years old, it’s time to replace the battery. Fortunately, battery replacement is easy and you can do it yourself with just a few basic tools.
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