Audi key replacement

How to change your car key battery

We get asked this question a lot and whilst we can do this for you it may be a more cost effective and quicker option for you to do it yourself.

If you notice that your car key fob only opens the doors now and again, or it does not lock or unlock the car at all, this could be a tell-tale sign that the fob battery needs replacing. Even though you may still be able to use the manual key function of the fob to secure your vehicle, the automatic lock and unlock feature can be extremely useful, so it’s worth knowing how to change the battery inside the fob when it needs replacing.

The good news is, changing the battery inside a car key fob is quick and easy for you to do at home. However, we are always here to help so if you are struggling with the below then give us a call on 01392 461200 or 07906 502129.

To determine that it is the battery that’s the problem, you can first check if the manual locks on the car still work. If they don’t, it could be an issue with the vehicle’s locking mechanism rather than the car key or the fob battery. If you have a spare fob for your car, you could try locking and unlocking the car with this too. If it works, you can assume that the battery in the other one is the problem.

Once you’ve established that the battery needs replacing, you’ll need to purchase a new one. In most cases, car key batteries are round and flat like a coin. To make sure that you buy the right type and size of battery, open the fob to look at the original battery.

You should be able to lift the part of the fob where the battery is situated by simply using your finger, but you can also do this using a flathead screwdriver. After carefully opening the fob casing, you should be able to see the battery inside. You can then remove the battery using your finger, or you could turn the fob upside down, give it a gentle tap and let the battery fall out into the palm of your hand.

On one side of the battery, you should be able to see a code. In most cases, this code begins with two letters, such as CR, and is followed by some numbers. You should make a note of this code or take a photo of it when purchasing a new battery for your car key fob. If you are struggling to find the code, you should be able to find this information in your car manual.

When you’ve got a replacement battery, simply slot it back into the fob, clip the casing back together and your key will be good to go.