Battery & Alternator Health Check
Quick checks. Clear answers. No guesswork.
Battery & Alternator Services at The Garage
Your battery and alternator work together to keep your car running. If either one starts to fail, it can leave you with warning lights, starting problems, or a flat battery – often at the worst possible time.
At The Garage, we test, diagnose, and replace batteries and alternators using the correct parts for your vehicle, with clear advice and no guesswork.
What Does the Battery Do?
The battery supplies power to:
Start the engine
Run electrical systems when the engine isn’t running
Support the alternator during high electrical demand
Over time, batteries naturally lose capacity, especially with:
Short journeys
Cold weather
Vehicles with lots of electrical features
Most car batteries last 3–5 years, depending on use.
What Does the Alternator Do?
The alternator:
Recharges the battery while the engine is running
Powers the car’s electrical systems
If the alternator isn’t working correctly, the battery won’t recharge — even if it’s brand new. This can lead to warning lights, dim lights, and eventual breakdown.
Signs of Battery or Alternator Problems
You may notice:
Difficulty starting the car
Clicking sounds when turning the key
Battery or charging warning light on the dashboard
Dimming or flickering lights
Electrical systems behaving unpredictably
Repeated flat batteries
If you’re unsure whether it’s the battery or alternator, we can test both.
Battery & Charging System Testing
We carry out battery and charging system checks to identify the cause of the problem.
Our checks include:
Battery condition and capacity testing
Alternator output testing
Charging system inspection
Advice on repair or replacement
We’ll explain the results clearly so you know exactly what’s needed.
Battery Replacement
If your battery needs replacing, we’ll fit the correct battery for your vehicle, taking into account:
Vehicle specifications
Stop/start systems
Electrical load requirements
All batteries fitted are covered by a manufacturer warranty.
Alternator Repairs & Replacement
Alternator issues can vary from wiring faults to complete unit failure.
If a repair or replacement is needed:
We’ll confirm the fault first
Explain the options available
Only carry out work with your approval
We won’t replace parts unless it’s genuinely required.
Book Battery or Alternator Checks at The Garage
If your car is slow to start, showing warning lights, or you’re experiencing electrical issues, it’s best to get it checked early.
Contact us or book in, and we’ll take care of it.
Battery & Alternator FAQs
How long does a car battery usually last?
Most batteries last between 3 and 5 years, but frequent short journeys and cold weather can shorten their lifespan.
How do I know if it’s the battery or the alternator?
Symptoms can be similar. A simple test will confirm whether the battery is failing or if the alternator isn’t charging correctly.
Can a new battery go flat if the alternator is faulty?
Yes. If the alternator isn’t charging properly, even a new battery will eventually lose power.
Can you test my battery without replacing it?
Yes. We can test your battery and charging system and advise whether replacement is necessary.
Do electric and hybrid vehicles use batteries and alternators?
Hybrid vehicles use both a conventional 12V battery and a high-voltage battery. Electric vehicles don’t use alternators in the same way, but still rely on a 12V system. We can advise based on your vehicle.