Repairs
Car Battery Replacement
Modern batteries are not just a box of power. On many vehicles a new battery has to be the right type and registered to the car.
Struggling to start?
Signs the battery is failing
- Slow cranking, especially first thing in the morning
- Needing a jump start after standing for a few days
- Stop-start system no longer working
- Multiple unrelated electrical warnings
- Battery more than a few years old with heavy short-journey use
Testing before replacing
We test the battery's state of charge and health, then check the charging system and look for parasitic drain. A battery that keeps going flat with a healthy alternator usually means something is drawing current when the car is parked — replacing the battery alone will not fix that.
Fitting it properly
- Correct type and specification, including AGM or EFB where required
- Battery registration or coding on vehicles with smart charging
- Cleaning and protecting terminals and checking earth connections
- Checking the charging system after fitting
- Old battery disposed of responsibly
Frequently asked questions
Advice
Helpful reading on this fault
Symptoms
Symptoms that often lead to this repair
Look up what your car is doing and read what it commonly means.
Car won't start and just clicksClicking means the electrical side is trying to work but the engine is not turning over properly. The pattern of the clicking is the most useful clue.Read more Battery warning light on while drivingThe red battery symbol is a charging-system warning. The engine is normally running on stored battery power only, which is limited.Read more Car hard to start when coldCold starting depends on battery condition, fuel pressure, compression and, on diesels, glow plug operation. Cold weather exposes weakness in any of them.Read more Flat battery: why it keeps going flatBatteries do wear out, but a battery that flattens repeatedly usually has help — either it is not being charged properly or something is draining it while the car is parked.Read more Signs your car battery needs replacingMost batteries give warning before they leave you stranded. Recognising it early usually means choosing when the car is off the road rather than being told.Read more Car battery keeps going flatRepeatedly flat batteries are rarely bad luck. Something is either draining the battery, failing to charge it, or the battery itself is finished.Read more
Related
You may also need
Car Won't Start?A car that will not start is not one fault — it is a shortlist. Working through that list in order is how you avoid buying parts you did not need.Read more Alternator ReplacementThe alternator keeps the battery charged and the electronics fed. When it fades, the car will usually run until the battery runs out — and then stop.Read more Starter Motor ReplacementStarter faults are often blamed on the battery and vice versa. Testing tells them apart in minutes.Read more Car Diagnostics & Fault Finding in IverA warning light tells you something has been detected — not what has failed. We diagnose the vehicle first so the repair that follows is the repair the car actually needs.Read more
Talk to us about car battery replacement
Based in Iver, covering West London, Berkshire and South Buckinghamshire. Send your registration and we will quote for your vehicle.