
Changing a car battery is a handy skill for any car owner to have, and it can save you money and the headache of being stranded with a dead battery. While it's a straightforward process, car batteries are heavy, corrosive, and flammable, so many drivers opt to get a professional to replace their dead battery. Car batteries generally need replacing every 3-5 years, and the process usually takes 30 minutes to an hour. Before you begin, make sure your car is parked on level ground, the engine is off, and the handbrake is on. You'll need an adjustable wrench, disposable rubber gloves, clean lint-free rags, baking soda and water, a battery brush, safety goggles, and possibly other tools. You should also be aware that you could void your warranty if you change the battery yourself.
| Characteristics | Values |
|---|---|
| Difficulty | Replacing a car battery can range from extremely easy to fairly difficult depending on the vehicle. |
| Frequency | Car batteries generally need replacing every 1-5 years. |
| Cost | While basic flooded lead acid batteries can cost under $150, the price of a suitable new battery increases with the size of the engine and modernity of electronics. |
| Time | Replacing a car battery typically takes 30 minutes to an hour. |
| Safety equipment | Safety goggles, disposable rubber gloves, clean lint-free rags, baking soda and water, a battery brush or post-cleaning tool. |
| Tools | Adjustable wrench, battery terminal and post cleaner, battery terminal protection kit, Interim Power Supply (optional). |
| Skills | It is important to be familiar with the process for changing a battery by consulting the car's manual and a battery manufacturer's reference guide. |
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What You'll Learn

Preparing to change your car battery
Before beginning the task, ensure you have the necessary tools and safety equipment. You will need an adjustable wrench for removing the battery terminals, clean lint-free rags or cloths, disposable rubber gloves, safety goggles, and a battery brush or post-cleaning tool. A towel should be placed over the fender to protect the paint from corrosive acid. It is also important to remove any jewellery from your hands or neck to avoid sparks and potential damage to the battery.
Additionally, you should confirm that your vehicle is turned off and in park mode with the handbrake engaged. This is crucial as modern vehicles have electronic control modules that rely on a constant power supply, and disconnecting the battery without an alternative power source can erase critical management software or memory settings. You can purchase an interim power supply to address this issue.
Finally, it is important to note that car batteries are heavy, corrosive, and potentially flammable, so extreme caution must be exercised during handling and disposal. Old batteries should be taken to special recycling centres for proper disposal, as they must never be placed in regular rubbish or recycling bins due to their toxic and corrosive nature.
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Disconnecting the old battery
Disconnecting your old car battery and replacing it with a new one is a straightforward process that can be done at home. However, it is important to note that batteries are heavy, corrosive, and potentially flammable, so you may want to consult a professional.
Before disconnecting your old battery, ensure your vehicle is turned off and in park mode. Modern vehicles run electronic control modules that manage engine, transmission, and vehicle functions, and these functions rely on a continued power supply. Without this, critical management software or memory settings may be erased. To prevent this, you can purchase an Interim Power Supply, which will ensure these memory functions are retained.
Next, you will need to disconnect the negative terminal first. Be extremely careful to keep your ratchet or spanner from contacting the positive terminal. If this happens, a spark may occur, and the energy in the battery is capable of melting spanners and starting a fire. Once the negative terminal is removed, wrap it with a rag and tuck it aside.
Now, you can proceed to disconnect the positive terminal. Loosen the nut and bolt that holds the battery cable clamp to the positive terminal (this will be labelled with a plus sign or 'POS'). Remember where you put the battery screws and ensure they don't roll under the car.
Finally, wear gloves and carefully lift out the old battery. It is important to dispose of the old battery legally and responsibly at special recycling centres. Old car batteries should not be disposed of in your regular rubbish or recycling bin.
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Removing the old battery
Removing the old car battery is a simple task that can be done at home. However, it is important to note that batteries are heavy, corrosive, and potentially flammable, so safety precautions are necessary. Before beginning, ensure you have the necessary tools, including an adjustable wrench, disposable rubber gloves, clean lint-free rags, baking soda, water, a battery brush, safety goggles, and a towel to protect your car's paint from corrosive acid. It is also crucial to read your car's manual to familiarise yourself with the specific procedure for your vehicle.
To start, park your car on level ground, turn off the engine, and engage the parking brake. If your vehicle has a negative ground, loosen the nut and bolt connecting the battery cable clamp to the negative terminal (labelled with a minus sign or 'NEG'). For a car with a positive ground, loosen the positive cable first. Remember to note where you place the battery screws to avoid losing them.
Once the terminal is removed, wrap it with a rag and set it aside. Then, carefully lift out the old battery, wearing gloves to protect your hands. Be cautious not to let the ratchet or spanner touch the positive terminal, as this could cause a spark or even start a fire.
After removing the old battery, it is essential to dispose of it legally and responsibly. Batteries are toxic and corrosive, so they must be taken to special recycling centres for proper disposal. Do not place old car batteries in your regular rubbish or recycling bin.
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Installing the new battery
Installing a new car battery is a straightforward process, but it is important to take safety precautions and follow the correct steps. Here is a detailed guide on how to install a new car battery in Australia:
Firstly, ensure your vehicle is turned off and in park mode. This is crucial as modern vehicles have electronic control modules that manage various functions and require a constant power supply. Without this, critical management software or memory settings may be erased. To prevent this, you can purchase an Interim Power Supply, which will maintain power to these functions during the battery change.
Next, put on some disposable rubber gloves and safety goggles for protection. If your vehicle has a negative ground, loosen the nut and bolt holding the battery cable clamp to the negative terminal (labelled with a minus sign or 'NEG'). For a vehicle with a positive ground, loosen the positive cable first (refer to your car manual for this information). Remember to keep the tools from contacting the positive terminal, as this could cause a spark or even a fire. Wrap the terminal with a rag and set it aside.
Now, carefully lift out the old battery, wearing gloves. Before installing the new battery, inspect the tray area and clean it if necessary. Clean and dry any corroded metal areas and paint them with acid-proof paint. Ensure the terminals are clean as well. Place the new battery into the tray, making sure it is oriented correctly. Reinstall the hold-down bracket, tightening it until you feel resistance, and then give it two more turns. Do not overtighten, as this can damage the battery.
Finally, apply a thin coating of high-temperature grease to the posts and terminal connections. Make sure all reconnected clamps have a solid grip on the posts. Now, you can reconnect the battery cables, ensuring they are attached in the correct order (refer to your car manual). Check that the battery is secure and does not move around. If your vehicle has a stop/start system, you may need to use a tool to reset the system and alert it to the new battery.
Always dispose of old batteries legally and responsibly at special recycling centres.
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Resetting the vehicle's computer
Step 1: Disconnect the Battery
Before disconnecting the battery, document all the specifications and labels. Take photos or write down the information for future reference. Ensure that your vehicle is turned off and in park mode with the parking brake set. This will protect the vehicle's electronic control modules, which manage engine, transmission, and vehicle functions, from power loss.
Step 2: Allow Residual Power to Dissipate
After disconnecting the battery, wait for the residual power in the electrical circuits to dissipate. This process can take anywhere from 15 minutes to an hour. This step ensures that all stored electricity is cleared, effectively resetting the computer to its default or factory settings.
Step 3: Reconnect the Battery
Once the residual power has dissipated, you can reconnect the new battery. Start the car and drive as you normally would for a short distance or approximately 10-15 miles. This distance will vary depending on your vehicle, and specific models may require you to manually reset certain systems like the clock or infotainment system.
Step 4: Allow the Vehicle's Computer to Relearn
During the drive, the vehicle's computer will relearn your driving habits and make necessary adjustments. This process may take some time, and you may need to drive for 30-45 minutes to help the computer adapt to your driving style.
Additional Considerations:
- Some vehicles, like certain Mercedes and BMW models, may require proper coding or registration procedures to ensure the vehicle recognizes the new battery.
- If you have a newer car, you can use an OBD-II scanner to connect to your vehicle and scan for any potential issues or trouble codes after replacing the battery.
- If you are unsure about any part of the process, it is best to consult a professional mechanic to avoid any potential issues with your vehicle's electrical systems.
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Frequently asked questions
There are several signs that your car battery is flat or dead and needs to be replaced. These include the engine being slow to crank or not starting at all, dim headlights, electrical issues, a swollen battery casing, or a build-up of corrosion on the battery terminals.
Depending on driving conditions, climate, maintenance, and the quality of the battery, a car battery should last between one and five years.
You will need an adjustable wrench, disposable rubber gloves, clean lint-free rags, baking soda and water, a battery brush or post-cleaning tool, and safety goggles. You should also consult your car's manual for specific instructions.
First, make sure your car is turned off and in park mode with the handbrake on. Then, put on your safety gear and remove the negative terminal first, being careful not to let your tools contact the positive terminal. Wrap the terminal in a rag and set it aside. Next, undo the bolt for the hold-down bracket and carefully remove the battery. Before installing the new battery, inspect and clean the tray area. Place the new battery into the tray, ensuring it is in the correct orientation, and reinstall the hold-down bracket. Finally, apply a thin coating of high-temperature grease to the posts and terminal connections.











































