What is the best battery for your car? A foolproof guide
RSS
The best battery for your car respects four figures: capacity (Ah), cranking current (CCA/A), technology (conventional, EFB or AGM) and size + terminal position. If those four match, you are right. The fastest, error-free way is to check by your number plate.
There is no universal «best» battery
A battery that is great for a city car can fall short on a Start-Stop car, and one that is too big will not fit. «The best» is always the one that matches your car, not the most expensive or the highest-amp one.
The 4 figures that must match
Capacity (Ah)
The energy it stores. Match what your car asks for; you can go up a little with care.
Cranking (CCA)
The power to start in the cold. Never below the original value.
Size and terminals
Length × width × height and the positive-terminal side. If it does not fit, it is no good.
We expand every term in the battery glossary and the technology differences in EFB, AGM or conventional.
How many amps (Ah) does your car need?
As a quick reference by car type (always confirm with your plate or the battery label):
| Car type | Capacity (Ah) | Cranking (CCA) | Technology |
|---|---|---|---|
| Small petrol city car | 40–50 Ah | 360–450 A | Conventional |
| Compact / mid-size | 55–65 Ah | 480–580 A | Conventional / EFB |
| Diesel or SUV | 70–80 Ah | 640–760 A | EFB / AGM |
| Start-Stop (regen braking) | 70–95 Ah | 720–850 A | AGM |
Fitting a little more Ah is usually safe and adds margin; much more adds nothing and may not fit. We cover it in what happens if you fit more amps.
How to find your car’s figures (3 ways)
- Your current battery label: it shows the Ah, the CCA and often «AGM» or «EFB».
- By number plate: the fastest, error-free way, with the plate finder.
- By make and model: from the battery finder.
How long does a car battery last, and when to replace it?
A car battery lasts 4 to 6 years on average. Cold, short trips and heavy electrical demand shorten it, so it is worth checking from the fourth year.
Signs it needs replacing: the engine cranks slowly or «tired» in the cold, lights dim at idle, the battery warning light comes on, or the car switches off Start-Stop. With any of these, replace it before you get stranded.
Does the brand matter?
Less than you think if you pick a top-tier brand in the right technology. If you are torn between makers, we compare them in which battery brand is best. Replacing yours? See how to choose the correct replacement.
Find and buy the exact battery for your car
Stop guessing: enter your number plate and in seconds we show the battery that fits your car, ready to buy with fast delivery at the best price.
Find my battery by number plateFrequently asked questions
How many amps (Ah) does my car need?
Whatever the original battery label states: typically 40–50 Ah for city cars, 55–65 Ah for compacts and 70–95 Ah for diesels, SUVs and Start-Stop. Confirm by your plate.
Can I fit a higher-capacity (Ah) battery?
A little more Ah is usually safe and adds range; much more adds nothing and may not fit. We explain it here.
How long does a car battery last?
4 to 6 years on average. Cold, short trips and Start-Stop shorten it; check it from the fourth year.
How much does a car battery cost?
It depends on capacity and technology: conventional batteries are the cheapest and AGM Start-Stop the most expensive. Enter your plate and we show the exact price of the one you need.
Can I fit an AGM in a car without Start-Stop?
Yes, it works perfectly because it is a superior battery; you just will not use all its advantage.
How do I know if my car is Start-Stop?
If the engine stops on its own when you halt, it is, and it needs EFB or AGM. You can also check by your plate.