To replace your battery, the new one must match or exceed four figures of the current one: capacity (Ah), cranking (CCA), technology and size. Golden rule: you can go up from conventional to EFB or AGM, but never down from AGM to a lower type.

Copy your current battery’s figures

Before buying the replacement, look at the label of the battery you have and note:

Capacity (Ah)

The energy it stores, e.g. 70 Ah.

Cranking (A/EN)

The cold cranking current, e.g. 640 A.

Technology

If it says «AGM» or «EFB», copy it exactly.

Size and terminals

Length × width × height and the positive-terminal side.

The golden rule: match or upgrade, never downgrade

Conventional → EFB → AGM: you can move up in technology, never down. If your car came with AGM, fit AGM; a lower technology causes faults, warning lights and a very short life. Why, in EFB, AGM or conventional.

You can go up a little in capacity (Ah) with care for extra margin, keeping the same size and technology. The limits, in what happens if you fit more amps.

How to find the equivalent battery

Many batteries carry an ETN code (5 digits) or the European case code (L1, L2, L3…): two batteries with the same size and performance are equivalent even if the brand changes.

How often should you change a car battery?

On average, every 4-6 years. In the city with many starts, short trips or cold weather, it may be sooner. If the car cranks slowly, lights dim at idle or Start-Stop stops working, it is time to replace it even if it has not left you stranded yet.

Can I change the battery myself?

On simple cars, yes: with the engine off, disconnect the negative terminal first then the positive, swap the battery and reconnect in reverse order (positive first, negative last). Tighten well and secure the battery.

Careful on modern cars: many with Start-Stop have a smart sensor and the new battery must be registered/coded with a diagnostic tool. Also, disconnecting can lose the radio code and settings; use a memory saver or have the codes handy. If in doubt, use a workshop.

Is it worth upgrading the technology or brand?

Going from EFB to AGM is worth it if you do many starts or have heavy electrical demand: you gain cycles and life. On the replacement brand, we compare in which battery brand is best; unsure which fits, see what is the best battery for your car.

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Enter your number plate or your battery reference and we show the exact replacement and its equivalents, ready to buy with fast delivery.

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Frequently asked questions

Can I fit a battery different from the factory one?

Yes, as long as it matches or exceeds its figures (Ah, CCA, technology) and fits the size and terminals. You may upgrade the technology, never downgrade.

How often should a car battery be changed?

On average every 4-6 years. Cold, short trips and Start-Stop shorten it; check it from the fourth year.

Does the new battery need registering or coding?

On many cars with Start-Stop and a smart sensor (IBS), yes: it must be registered with a diagnostic tool so the charging system treats it as new. Without it, it lasts less.

Can I change the battery myself?

On simple cars yes, disconnecting the negative first. On modern cars, mind the battery registration and losing the radio code: use a memory saver or go to a workshop.

Is there equivalence between brands?

Yes: every model has equivalents from other brands with the same specs. Search by reference in the reference index.

Can I add more amps while replacing?

A little more Ah is fine and gives some margin, keeping the same size and technology; see the limits here.