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Tyres > Help > How To > How to change a car battery

How to Change a Car Battery: A Step-by-Step Guide

Changing a car battery might seem like a tough task, but if you have the right tools and follow some straightforward steps, it is a job that you can complete yourself - safely and efficiently.

This guide will take you through the steps of changing a car battery. Whether you're a seasoned DIYer or a first-timer, our advice will help you change your battery. Making it straightforward and stress-free.

Remove dents from car

What You'll Need


• A new car battery

• Safety gloves and goggles

• Wrench set

• Battery cleaning solution

• Anti-corrosion spray

• A clean cloth

• A battery carrier or an assistant for safety

Step-by-step guide

Step 1: Safety first

Begin by ensuring your vehicle is parked on a flat surface, with the engine turned off and the keys removed. Put on your safety gloves and goggles. These will protect you against any acid or other dangerous materials.

Step 2: Locate the Battery

Open your car's bonnet and locate the battery. If you are unsure where it should be, have a look in your vehicle’s handbook. The location can vary between models.

Step 3: Disconnect the cables

Starting with the negative (-) cable, usually marked in black or with a minus sign, then followed by the positive (+) cable.

Use a wrench to loosen the cable clamps and detach them safely.

Step 4: Remove the Old Battery

Unfasten any screws (or clamps) that might be holding the battery securely. Then carefully lift the battery out of the car, using a battery carrier if available.

Please note, batteries can be heavy and awkward to lift – so if you require assistance, make sure to ask for it, if available.

Step 5: Clean the Battery Tray

Before installing the new battery, clean the tray and connectors with a battery cleaning solution. Make sure you dry this after thoroughly with a clean cloth.

Step 6: Install the New Battery


Place the new battery in the tray, ensuring it's securely fastened. Use the same screws and/or clamps as before. You will need to then apply an anti-corrosion spray on the terminals to prevent rust and corrosion.

7. Reconnect the Cables


Reattach the positive cable first, followed by the negative. Make sure the connections are tight and secure.

8. Test the Battery


Start your vehicle to ensure the new battery is functioning correctly. Check that all electronics are working and there are no warning lights on the dashboard.

Safety Tips


• Never smoke near a car battery.

• Ensure the car is completely turned off before starting the replacement process.

• Dispose of the old battery properly by taking it to an appropriate recycling centre. You will likely need to check online before taking the battery, a not all centres have the facilities to dispose of the battery.

Removing Car Dents

It's essential to approach car dent repair with a thorough understanding of the process and an awareness of when professional help is needed.

For the most severe cases, professional body shops employ techniques such as paintless dent repair (PDR), which might be beyond the scope of DIY repairs.

DIY car dent repair is a valuable skill, offering a cost-effective solution to maintaining your vehicle's aesthetic appeal.

Remember, while many dents can be successfully repaired at home, assessing the damage accurately and acknowledging when to call in professionals is crucial to preserving your car's condition and value.

Changing a car battery

Changing a car battery is a manageable task that can save you time and money.

By following these steps and adhering to safety precautions, you can ensure a successful battery replacement.

Remember, maintaining your car’s battery can extend its life and prevent unexpected failures.

FAQ: Car Battery Replacement Guide

What are the signs that you need to change your car battery?

Signs include dimming headlights, slow engine crank, the need to press the accelerator pedal to start, and the age of the battery exceeding 3-5 years. A swollen battery case and the check engine light can also indicate it's time for a change.

How do you choose the right battery for your car?

Select a battery by checking your car’s manual for specifications or consulting with an auto parts store. Ensure the battery size, terminal locations, and type (lead-acid or AGM) match your car’s requirements.

How often should a car battery be replaced?

Most car batteries need replacing every 3-5 years, depending on usage, climate, and vehicle type. Regular testing after the 3-year mark can help determine the right time to replace.

Are there any differences in changing the battery of an electric vehicle (EV) or hybrid?

Yes, EVs and hybrids often have complex battery systems that require professional handling due to higher voltages and specific technical requirements. Consult your vehicle’s service provider for assistance.

What are the common mistakes to avoid when changing a car battery?

Avoid reversing the terminal connections, which can cause electrical damage. Ensure the car is off to prevent short circuits. Don’t forget to secure the new battery firmly to avoid vibrations.

Can weather affect your car battery, and how?

Extreme temperatures can affect battery performance. Cold weather can reduce its capacity, while hot weather can speed up corrosion and fluid evaporation, shortening its lifespan.