Do Halfords Replace Car Key Batteries?
Yes, Halfords replace car key batteries in store for a £7 fitting charge plus the price of the battery, after a member of staff inspects the key. The service excludes keys that require a dealer reprogramming procedure or access to the car. A new battery cures a flat cell only, so a key fob with worn buttons, water damage or lost pairing still fails after the battery change.
Car Key Battery Finder
Pick the type of car key.
The usual battery is a CR2032, CR2025, CR2016, CR1620 or CR1632. A counter battery change suits this car key after inspection.
The usual battery is a CR2032 or a CR2450. A counter battery change suits this car key after inspection.
The battery is a VL2020 cell soldered to the circuit board. A counter battery change does not suit this car key.
The car key has no battery. The transponder chip takes its power from the car.
Still stuck? Call 07830249408 and I talk you through it by phone.
What Does the Halfords Key Battery Service Include?
The Halfords key battery service is an in store fitting service for the coin cell in a car key. The Halfords key battery service includes 4 parts, listed below. The terms of the service are the published Halfords terms, checked in October 2026.
- Inspection. A member of staff inspects the key before agreeing to the battery change.
- Fitting. The fitting charge is £7.
- Battery. The coin cell is a separate purchase and is not part of the £7.
- Location. The service runs throughout Halfords stores.
The service is a car key battery change only. The Halfords help pages list no key fob repairs and no car key programming.
How Much Do Halfords Charge for a Car Key Battery?
Halfords charge £7 to fit a car key battery, and the battery is extra. A twin pack of CR2032 coin cells was £7.50 at Halfords in October 2026, which brings a first visit to £14.50 with one spare cell left over. Fitting the same cell at home costs the price of the battery alone.
A key fob repair has no fixed online price, because the cost depends on the vehicle make, the model, the key type and the fault. DB Car Keys confirms the likely method and the price by phone on 07830 249408 before travelling.
Which Car Keys Do Halfords Not Change Batteries For?
Halfords do not change batteries for 2 groups of car keys, and a third group has no battery to change at a counter.
- Keys with a dealer reprogramming procedure. Halfords state that some keys require a dealer to complete the reprogramming procedure.
- Keys that require access to the car. Halfords state that some keys require access to the vehicle in a location where access is not possible.
- Keys with a sealed case. Older BMW keys, for example, hold a rechargeable VL2020 cell that is soldered to the circuit board and charges in the ignition slot.
The inspection decides each case, so the same store accepts one car key and declines another.
What Do You Check Before Going to Halfords?
Check 6 things before going to Halfords, because the checks show whether the car key battery is the real fault.
- Remote range. A weak car key battery shortens the locking range before the remote stops.
- Dashboard message. Many cars show a key battery low warning.
- Spare key. A spare key that works proves the car is healthy and the first key is at fault.
- Fob shell. A cracked shell lets the battery move off the contacts.
- Water or impact damage. Corrosion on the circuit board outlasts any new battery.
- Push button start. A keyless car that reports no key detected has a weak cell or a fob fault.
Checks 1 and 2 point to the battery. Checks 4 and 5 point to a key fob repair, and a new battery does not cure either fault.
How Do You Replace a Car Key Battery Yourself?
Replace a car key battery yourself in 5 steps, with a small flat screwdriver and the correct 3 volt coin cell.
- Read the number on the old cell or in the vehicle handbook. CR2032 is the most common car key battery.
- Slide out the emergency key blade with the release catch.
- Open the shell at the seam or at the battery door with the screwdriver.
- Lift out the old cell and fit the new cell with the plus side facing the same way.
- Close the shell and test lock, unlock, boot release and engine start.
What Do You Avoid When Changing a Key Fob Battery?
Avoid 4 mistakes when changing a key fob battery, because each mistake turns a battery job into a key fob repair.
- Levering against the circuit board. A metal tool scratches the tracks and lifts components.
- Fitting a cell of the wrong thickness. A CR2025 is 2.5 mm (0.1 inch) thick and a CR2032 is 3.2 mm (0.13 inch) thick, so the thinner cell sits loose on the contacts.
- Fitting the cell upside down. A reversed cell gives the remote no power.
- Leaving before a full test. Test lock, unlock, boot release and starting before parking the car somewhere awkward.
A new battery does not prove the fob is fixed. Photos of the key and the dashboard warning lights, sent by WhatsApp, let the technician advise before a visit.
Which Battery Does Each Car Key Type Use?
Each car key type uses a 3 volt lithium coin cell or no battery at all. The table below lists the usual battery for 4 car key types and whether a counter battery change suits each type.
| Car key type | Usual battery | Counter battery change |
|---|---|---|
| Remote key with a flip blade or a fixed blade | CR2032, CR2025, CR2016, CR1620 or CR1632 | Suitable after inspection |
| Smart key for keyless entry and push button start | CR2032 or CR2450 | Suitable after inspection |
| Sealed key with a rechargeable cell | VL2020, soldered to the circuit board | Not suitable |
| Blade key with a transponder chip and no buttons | No battery | Not required |
The transponder chip that starts the engine takes its power from the car and not from the car key battery. A remote that looks correct still fails when the frequency, the chip, the circuit board or the blade profile does not match the vehicle.
When Does a Key Fob Need a Repair?
A key fob needs a repair and not a battery when the remote still fails with a new cell fitted the correct way round. A new cell cures a dead key fob battery and nothing else. The 5 usual faults are listed below.
- Worn button switches under the rubber pad.
- Cracked solder joints on the battery holder.
- Corroded tracks after water damage.
- Broken shell that lets the cell move.
- Lost pairing between the remote and the car.
The symptom separates the faults. A key that starts the car while the lock and unlock buttons fail has a remote fault. A key that does not start the car has an immobiliser recognition fault or a programming fault. DB Car Keys carries out key fob repairs at the car, covering remote buttons, shells, battery contacts and replacement fobs.
How Does a Mobile Key Fob Repair Visit Work?
A mobile key fob repair visit brings the workshop to the vehicle and follows 5 steps. The van carries diagnostic equipment, key programming tools, key blanks, remote fobs and a full range of fob batteries.
- Call or WhatsApp. Send the vehicle make, model, year, registration and location.
- Confirm the method. Dean checks whether the job is a battery contact repair, a new shell, a pairing job or a replacement fob.
- Get a clear quote. The price is confirmed before travelling where the details allow.
- Work on site. The fob is repaired, or a key is cut and programmed, at your location.
- Final test. Locking, unlocking, starting and remote functions are tested before the job is closed.
Where Else Can You Replace a Car Key Battery?
A car key battery is replaced in 4 places. The table below compares the cost and the scope of each place.
| Option | Cost | Scope |
|---|---|---|
| At home | The battery only | Battery change on fobs that open at a seam or a battery door |
| Halfords | £7 plus the battery | Battery change in store, after inspection |
| Main dealer | Set by each dealer | Batteries, programming and new keys, by booking |
| Mobile auto locksmith | Confirmed before travelling | Batteries, key fob repairs, programming and replacement keys at the car |
A main dealer suits some software restricted vehicles and often requires a booking, proof checks and recovery when the vehicle does not drive. A breakdown provider handles safety and recovery and does not usually cut or program a key at the roadside. A mobile auto locksmith sits between the two, with key cutting, key programming and diagnostics at the vehicle.
Frequently Asked Questions About Halfords Car Key Batteries
Do Halfords Replace Car Key Batteries for Free?
No, Halfords do not replace car key batteries for free. The fitting charge is £7 and the battery is extra.
Do Halfords Sell Car Key Batteries?
Yes, Halfords sell car key batteries in store and online. The range covers 3 volt coin cells such as the CR2032, and a driver who buys the cell alone fits the battery at home.
Do Halfords Reprogram Car Keys?
No, Halfords do not reprogram car keys, free or paid. The Halfords help pages list one car key service, the key fob battery fitting, and state that some keys require a dealer for the reprogramming procedure. Car key programming is carried out at the car by a mobile auto locksmith.
Do Halfords Replace Car Keys?
No, Halfords do not replace car keys, and the Halfords help pages list no car key cutting or replacement service. A mobile auto locksmith supplies and programs a new key fob at the car, and DB Car Keys publishes £120 to £250 for that job.
Does a Car Key Need Reprogramming After a Battery Change?
No, most car keys keep their programming after a battery change, because the key stores its code in memory that does not rely on the battery. A small number of remotes lose synchronisation and require a pairing routine.
What Happens if My Key Fob Battery Dies?
A key fob battery that dies stops the remote from locking and unlocking the car at a distance, and the emergency key blade inside the fob still opens the driver door. A dead key fob battery also stops a keyless car from starting, until the fob is held against the start button.
How Often Do Car Key Batteries Need Replacing?
Car key batteries need replacing every 2 to 4 years in most fobs. A keyless smart key drains the cell faster than a button remote, because the smart key answers the car each time the driver comes within range.
Do I Need a Mobile Auto Locksmith for a Car Key Battery?
No, a flat car key battery alone does not call for a mobile auto locksmith. A mobile auto locksmith is the practical option when the fob still fails after a new battery, the key is missing, the car does not unlock or the immobiliser does not recognise the key. DB Car Keys attends across Devon, Dorset and Somerset and advises by phone before travelling.
Can DB Car Keys Help With Key Fob Repairs?
Yes. DB Car Keys repairs key fobs as part of its mobile auto locksmith service. The repair covers remote buttons, shells, battery contacts and replacement fobs, and the van carries a full range of fob batteries.
Is the Job Done at the Vehicle?
Yes, the job is done at the vehicle in most cases. The van carries key cutting, programming and diagnostic equipment, so the work is completed at a home, a workplace, a roadside location or a car park.
Do I Need Proof of Ownership?
Yes, you need proof of ownership for replacement keys and programming work. The proof shows that the vehicle is yours or that you have permission to authorise the work, and the check protects customers and vehicle security.
Can Old Lost Keys Be Deleted?
Yes, old lost keys are deleted from the vehicle memory on many vehicles during the replacement process. Deletion matters most when a key was stolen and not simply misplaced.
Which Vehicle Makes Are Covered?
All major UK vehicle makes are covered, including Ford, Vauxhall, BMW, Audi, Volkswagen, Mercedes, Peugeot, Citroen, Toyota, Nissan, Renault, Kia, Hyundai, Honda and Land Rover.
Is It Cheaper Than Going to a Main Dealer?
A mobile auto locksmith is often faster and more convenient than a main dealer, because the vehicle does not usually require recovery or a booking days ahead. The exact price depends on the vehicle and the key type.
How Do I Get Help Now?
Get help now by calling 07830 249408 or by sending a WhatsApp message with your location, registration, make, model and the fault. Dean confirms the next step and gives a clear quote before attending.
DB Car Keys covers Devon, Dorset and Somerset, including Exeter, Plymouth, Taunton, Yeovil, Weymouth, Dorchester and Honiton.
DB Car Keys works on everyday hatchbacks, vans, family SUVs, farm vehicles, prestige cars and commercial fleets across the 3 counties. The makes include Ford, Vauxhall, BMW, Audi, Volkswagen, Mercedes, Toyota, Nissan, Peugeot, Citroen, Renault, Kia, Hyundai, Honda and Land Rover.
Typical calls include a Ford Transit spare key for a tradesperson, a Vauxhall Astra lockout at home, an Audi remote fob that stops communicating, a Renault key card fault and a Land Rover proximity fob replacement on a rural property.
Dean answers in plain words
Is Halfords worth the trip for a car key battery?
For a plain flat battery, yes. It is a quick job for them at £7 plus the cell. I would ring the store first, because they inspect the key and they turn some keys away.
What if the new battery changes nothing?
Then the battery was never the fault. That is where I come in, because the buttons, the contacts or the pairing have gone, and I fix those at the car.
A new car key battery does not cure a damaged fob. DB Car Keys attends homes, workplaces, roadside locations and car parks across Devon, Dorset and Somerset. Call with your make, model, registration and location for a clear next step.