A car key battery replacement costs £2 to £8 for the battery, and most drivers fit it at home in a few minutes. A fob that stays dead after a new battery has a fault. A car key fob repair costs £40 to £100.
New battery and the fob is still dead? Call 07830249408 in Devon, Dorset or Somerset. I test the fob at the car and confirm the price before work.
The sections below give the car key battery replacement cost, the battery types, the 5 signs of a weak battery, the 4 steps and the cost when a new battery does not fix the key fob.
A car key battery replacement costs £2 to £8 for the battery. A fob repair costs £40 to £100 and pairing a fob again costs £60 to £120.
What Does a Car Key Battery Replacement Cost?
A car key battery replacement costs £2 to £8 for a single coin cell battery, by brand and by pack size. The table below lists the 3 outcomes and the cost of each.
| Outcome | What Happens | Cost |
|---|---|---|
| The battery alone | A coin cell is bought and fitted at home | £2 to £8 |
| The fob stays dead | The fob is tested and repaired | £40 to £100 |
| The fob lost its pairing | The fob is paired to the car again | £60 to £120 |
A shop or a dealer fits the battery at the counter for a small fee on top of the battery price.
Which Battery Does a Car Key Take?
A car key takes a 3 volt coin cell battery, and the CR2032 is the most common type. The other types are the CR2025, the CR2016, the CR1620 and the CR2450.
The type is printed on the old battery and listed in the handbook. A battery of the wrong thickness sits loose in the holder, so the fob works on and off.
What Are the 5 Signs of a Weak Car Key Battery?
The 5 signs of a weak car key battery are a shorter range, more than 1 press to lock, a dim fob light, a dashboard warning and a fob that works on and off.
- A shorter range. The fob only works next to the door.
- More than 1 press. The car locks on the second or third press.
- A dim fob light. The light on the fob is faint or stays off.
- A dashboard warning. Many cars show a key battery message.
- A fob that works on and off. The fob works on 1 day and fails on the next.
A car key battery lasts 3 to 5 years in most fobs.
How Is a Car Key Battery Replaced?
A car key battery is replaced in 4 steps, which are opening the case, noting the battery position, fitting the new battery and testing the fob.
Open the case
Slide out the emergency blade and twist a flat tool in the slot.
Note the position
Look at which side of the old battery faces up.
Fit the new battery
Seat the new coin cell the same way up, without touching both faces.
Test the fob
Close the case and lock and unlock the car.
What if a New Battery Does Not Fix the Key Fob?
A key fob that a new battery does not fix costs £40 to £100 to repair, because the fault is in the buttons, the contacts or the circuit board. A fob that lost its pairing costs £60 to £120 to pair again.
A fob with a new battery and no response needs a test at the car. A car key fob repair is done on site in Devon, Dorset and Somerset.
Does a Car Key Need Programming After a Battery Replacement?
A car key needs no programming after a battery replacement on most cars, because the chip keeps its code with no power. A few fobs lose the remote pairing, and the guide on how to reprogram a key fob after a battery replacement lists the steps by make.
Where Is a Car Key Battery Replaced?
A car key battery is replaced at home, at a key cutting shop or at a main dealer. The battery is the same coin cell at each place, and only the fitting fee changes.
Frequently Asked Questions About Car Key Battery Replacement Cost
It is £2 to £8 to replace a car key battery when the battery is fitted at home.
A Ford key battery replacement costs £2 to £8 for the battery. Most Ford fobs take a CR2032 or a CR2025, and the type is printed on the old battery.
A dealership charges a fitting fee on top of the £2 to £8 battery to replace a key fob battery. The fee is set by each dealer.
A car key battery is changed at home by opening the case and swapping the coin cell. The guide on how to change a car key battery shows each step.
A dead key fob battery stops a keyless car from starting until the fob is held against the start button. The guide on a dead battery in a key fob explains the backup start.
A car key battery lasts 3 to 5 years in most fobs. A keyless fob uses the battery faster than a remote key.
A key fob repair costs £40 to £100 after a battery change that did not fix the fault. The guide to the cost to repair a damaged car key fob lists each fault.
Dean answers in plain words
Do I have to bring the car to you?
No. I come to your home, your workplace or the roadside. No towing and no booking in.
How do I get a price?
Call with the make, model and year. The quote is free and you get it before I travel.
Based in Honiton. Working since 2009. Dealer level programming equipment on the van.
Free upfront quote. Available 24 hours a day.