Car Key Battery Replacement
Has your car key stopped working? It might just be that you need a car key battery replacement, it is a quick and easy fix once you know how. Our blog covers how to check it is your car key battery and what to do if it is not the battery causing faults with your car key fob.
Check your Car Key Battery
Before you replace your car key battery unnecessary run through our checklist to rule out another fault.
1. Try Another Key
An easy test is to just try another car key. If that works jump down to How to Replace a Car Key Battery.
2. Check Car Manual Locks
If your car won’t unlock when using an alternative key or the car doesn’t unlock when using the key manually, it won’t be down to a flat battery. It may be due to the cars locking mechanism becoming faulty or in some cases the remote entry feature may have become disabled. In which care the car key will need reprogramming. Find an Auto Locksmith to help you out in these situations.
How to Replace Car Key Battery
Replacing your car key battery is quick, cheap, and easy.
1. Open the Car Key Fob
Gently prise open the fob using a flat head screwdriver.
2. Check the Battery
Make a note of the battery code before buying a new one to ensure correct replacement. It usually starts with two letters followed by some numbers.
3. Finalise
Place the new battery inside the fob, put the casing back on and dispose of the old battery correctly. Be warned these round type batteries are extremely dangerous to children and animals who may swallow them accidentally.
Car Key Battery – Top Tips:
1. Replace sooner rather than later!
If your car key battery is left outside of the car key fob for too long, it may stop communicating with the car. If this happens you will need specialist help from an Auto Locksmith who will reprogram your car key.
2. Constantly replacing car key batteries?
If you find the car key battery keeps running out it is probably a fault with the car key fob. Seek an Auto Locksmith if this happens.
Keytek® Auto Locksmiths
If you need an auto Locksmith, we can help! Keytek® have teamed up with the UK’s largest auto Locksmiths to ensure we can help with any of your car key problems.
Locked out of your Car? Or Need a Car Key Replacement?
Leigh Edgley
From Yorkshire hills to Dorset shores, Leigh has spent 14 years mastering the art of getting people back on the road. As Keytek's trusted Auto Locksmith covering Poole, Bournemouth, Christchurch, and beyond, he's turned vehicle emergencies into his specialty over the past 8 years.
Beyond the tools and techniques, Leigh shares his deep automotive expertise through Keytek's website content, helping drivers understand the complexities behind modern car key technology. His real-world experience with transponder programming, remote diagnostics, and security systems translates into practical guidance that helps resolve automotive locksmith issues for everyday drivers.
What sets Leigh apart isn't just his technical expertise—it's his understanding that being locked out of your car isn't just inconvenient, it's genuinely stressful. His calm approach transforms panic into relief, whether you're stranded in a car park or stuck outside your own driveway.
When he's not rescuing drivers, Leigh embraces his own freedom on his Harley Davidson, or pushing limits through rock climbing, kite surfing, and spearfishing. This adventurous spirit fuels the problem-solving mindset that makes him Dorset's go-to auto locksmith.
