Book a Car Battery Replacement & Fitting in Cardiff

£242.02

Average price for this repair in Cardiff in the last 30 days^

Trustpilot rating for all RAC Mobile Mechanics.

Why choose the RAC for a car battery replacement?

With RAC Mobile Mechanics, you can avoid the hassle of taking your vehicle to a garage. They can do battery replacement and fitting on your driveway, so you don't even need to leave the house.

We use only quality batteries that meet OEM standards – that means they meet your vehicle manufacturer’s strict quality criteria, with a minimum 3-year warranty as standard. The price includes fitting, ensuring no surprises on the day. No hidden costs, just friendly, honest experts.

Close up of an RAC Mobile Mechanic underneath a car

Our top pick in Cardiff

We’ll come to you at home or work

RAC Mobile Mechanic in Cardiff

At the RAC, we’ve got over 125 years’ experience in offering complete peace of mind to our members. We’re best known for our breakdown service. And now – our new RAC Mobile Mechanics are here to help make every day motoring easier. If you need a service or repair, they’ll come to you at your home or work.

Car battery replacement

From £160^^

If your car won’t start due to a dead or failing battery, our mobile mechanics can test your battery, provide a replacement, and install it on the spot at home or work, saving you the hassle of going to a garage.

OEM quality parts

We use original equipment manufacturer (OEM) standard parts, which means every new part will be the same standard and same quality as the original part it replaced.

Mechanics you can trust

Our mobile mechanics are friendly, honest, and backed by the RAC.

Vehicle diagnostic check

£99

We’ll spend up to 30 mins checking our car’s onboard management system for faults. We’ll talk you through repairs needed and provide a full report. If any further work is needed, we’ll agree this with you before we start. Any additional work after the first 30 minutes will be priced at £20 per 15 minutes. We’ll agree this with you before proceeding.

Diagnostic check

We’ll look for any mechanical or electrical problems. If we need to, we’ll also check your car’s onboard engine management system. Depending on your car and issue, this will usually include: – Engine – Power steering – Brakes – Transmission – Exhaust system – Fuel injection system – Cooling system and air flow – Sensors

Full error report and advice on repairs

If we detect any issues, we'll talk through what needs to be repaired. We’ll give you a no-obligation quote to fix it on the spot, if we can. Or we’ll recommend a local RAC Approved Garage, and give you a full error report to take there.

Average cost of a car battery replacement by car make^

The cost to replace your car battery will depend on the car you drive and battery recommended. According to RAC data, the average cost to replace a car battery is £214. But you can check out the average price of a car battery replacement for your specific car make here.

Make	Average price
Ford	£230
BMW	£286
Volkswagen	£230
Mercedes	£258
Nissan	£224
Toyota	£234
Audi	£270
Vauxhall	£226
Peugeot	£235
Land Rover	£266

^Average price quoted for RAC Mobile Mechanics from 01/01/25 to 31/03/25.

And it’s not just car battery replacements that we do in Cardiff

Mobile mechanics bring the garage to you, saving you the hassle of getting your car to a garage. If you need a service or repair, they’ll come to you at your home or work.

A close up of an RAC mobile mechanic looking under the hood of a car

What our expert says

A healthy battery will help you avoid breakdowns and keep your car in top condition. An old worn battery can cause starting issues and could fail any time – leaving you stranded.

Nick Mullender

Lead RAC Mobile Mechanic

Try one of our RAC Approved Garages

View all garages

Causeway 4x4

5.0/5

We are a garage located in Dunball, Nr Bridgwater in Somerset just off Junction 23 of the M5 motorway. As Independent Landrover Specialists we specialise in 4×4 vehicle repairs, service, MOTs and spare parts. If you are looking for Land Rover or other vehicle service then look no further! Since re establishing in 2009 we now also offer service work, repairs and MOT’s to all vehicles, not just 4×4’s. We look forward to hearing from you!

Bristol Road, Dunball, Bridgwater, TA64TN

K&C garage

4.6/5

Local family friendly garage for all car and light commercial needs including mot's servicing brakes battery's clutches welding and any other motoring needs.

The Old Station Yard, Avonmill Lane, Keynsham, Bristol, BS312UG

Westerleigh Car Centre Ltd

4.0/5

The company has been in business since 1989 in Westerleigh Bristol,and operating from the site for 15 years.We moved to Downend Bristol in 2004, purchasing our own premises offering a larger workshop and showroom for vehicle sales. The company offers high quality services on today modern vehicles. We have become one of the largest, and best equipped independent garages in Bristol.Our workshop offers 7 ramps including two MOT Bays for class seven,class five,and class 4 MOT Testing,MOT Tests are carried out on two ATL test lanes at our premises.We are able to carry out mot tests on cars and light commercials Vans up to 3500 kg,Camper Vans,Motor Homes up to 5000 KG. Mini Buses,4-4s,We also have a full alignment lift for all your Geometry requirements, and some of the best equipment available to the garage industry.We are PRO-CUTS premier garage for brake disc skimming in Bristol. We aim to provide top quality service and commitment to our customers, whether it be fleet or private vehicles, The garage is a member of the RMI and is a fully approved Trust my Garage member,The garage is a fully approved Delphi Diesel and Fuel injection specialist, We have invested in the latest Delphi Software and equipment.We are able to test Diesel pumps and Injectors for correct operation using our equipment.We are able to deal with pump repairs in house, or we can offer a Delphi Service exchange pump normally within 24 hours.We are also able to send your pump to Delphi for repair, if a service exchange unit is not available of the shelf,The company has been appointed a fully approved, Unipart Diesel and Fuel Injection specialist,We are able to deal with all makes and models of cars and light commercials.All work is guaranteed to be of the highest possible standard and comes with a 6 month or 6000 miles Labour Warranty. All parts carry a minimum 12 Months or 12000 miles Warranty. All Unipart parts fitted have a nationwide warranty through the network of Unipart Service Centres. We carry a range of quality used vehicles. All vehicles have a new mot (if less than six months remaining) and have three months warranty. Cars also have a full pre-delivery inspection before leaving the workshop.Opening times for workshops,Monday to Friday 8:00am to 5:30pm Saturday 8:00am to 12:00pm Opening times for Vehicle Sales Monday to Friday 8:00am to 5.30pm Saturday 8:00am to 4:00pm.

84 Downend Road, Downend, BS16 5UE

Promotive BMW MINI

4.0/5

Promotive is one of the largest independent BMW and MINI specialists in the country. Our technicians are both BMW specialists & MINI specialists trained and have the most up-to-date diagnostic equipment to pinpoint any faults in your car as quickly and accurately as possible. Any parts that need to be replaced will be of the same quality as those that were originally fitted on your vehicle. We work to a code of practice. This commitment to customer care gives you peace of mind in knowing that you are going to be given not only the best technical service, but also the best customer service. Promotive is run by John O’Sullivan who has 30 years BMW knowledge and training.

66 Tregwilym Road, Rogerstone, Newport, NP109EJ

John Dolbear Tyre & Auto Services Ltd

3.1/5

John Dolbear Tyre and Auto Services are an established local independent garage and are proud to be members of Autofirst Network – a nationwide network of independent garages operating to the Network’s 6 core values of Capability, Consistency, Care, Clarity, Cost Effectiveness and Customer Focus. For your added peace of mind we are members of the Motor Ombudsman service which is approved by The Trading Standards Institute. In short, we are a local garage you can trust offering you the support and service guarantees of a national network, giving you complete peace of mind.

North Road, Cardiff, CF14 3AF

Frequently asked questions on car battery

How to charge an electric car battery

Charging your electric car battery involves:

Plugging into a charger: Use a home charger or a charging station.
Monitoring charging: Most electric cars have a display to show how charged the battery is.
Charging time: This varies depending on the charger and your electric car’s battery. Home chargers typically take six to eight hours. Fast chargers can take 30 to 60 minutes.

Always follow the guidelines for charging.

How do you change a car key battery at home?

To change your car key battery:

Open the key fob: Use a small screwdriver or coin to open the fob.
Remove the old battery: Take note of the battery type.
Insert the new battery: Make sure it’s the correct type and is oriented as it should be.
Close the key fob: Snap or screw it back together.

Check your car manual for exact instructions.

Can I replace the car battery myself?

Yes. You can replace a car battery on your own if you follow these steps:

Turn off the engine: Make sure your car is off.
Remove the old battery: Disconnect the negative (-) terminal first. Then disconnect the positive (+) terminal. Remove any clamps or brackets holding your car’s battery in place.
Install the new battery: Place your new battery in the tray. You can then secure it with clamps or brackets. Connect the positive (+) terminal first. Then connect the negative (-) terminal.
Test the battery: Start your car to make sure the battery is working.

If you’re unsure, use a professional service.

How do I know my car battery needs replacing?

Signs you need a new car battery include:

Slow engine cranking: The engine takes longer to start.
Dim lights: Headlights and inside lights are dimmer than usual.
Battery warning light: The battery or charging system warning light is on.

If you notice any of these signs, it’s time to get your battery checked.

What is the best type of car battery for my car?

The best car battery depends on your car and how you drive:

Standard lead-acid battery: Suitable for most cars with regular driving patterns.
AGM battery: Ideal for vehicles with high electrical demands or stop-start systems.
Deep cycle battery: Used in electric and hybrid vehicles.

Read your car manual or ask a professional for recommendations.

Is a car battery replacement covered under warranty?

Most car warranties cover battery replacement for a period. This is usually two to three years. Extended warranties may offer you longer coverage. Check your warranty details or talk to the provider for more info.

Can extreme weather affect my car battery?

Yes, it certainly can:

Cold weather: Low temperatures can decrease the battery's ability to hold a charge, making it harder to start the car.
Hot weather: High temperatures can cause battery fluid to evaporate, leading to potential damage.

Regular checks are important in extreme weather.

How do you recycle an old car battery?

Recycling an old car battery is important for environmental reasons as it can be very polluting.

Take it to a recycling centre: Many auto part stores and recycling centres take old car batteries.
Check local regulations: Some areas have specific guidelines for battery disposal.
Use a professional service: Many mobile mechanics and garages offer battery recycling services.

What’s the difference between a lead-acid battery and an AGM battery?

Lead-acid battery: Common, cost-effective, and reliable for most vehicles.
AGM battery: More expensive. It offers better performance and durability, in vehicles with high electrical demands or stop-start systems.

Talk to a professional to find the best battery for your needs.