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AGM batteries

AGM (Absorbent Glass Mat) batteries hold the electrolyte in glass-fibre mats: spill-proof, twice the cycle life of a conventional battery and very high cranking power. They are mandatory in cars with advanced start-stop and regenerative braking, and ideal for motorcycles, marine and any application with vibration and frequent discharges.

Cars with advanced start-stop (regenerative braking)
Motorcycles and powersports
Marine and leisure (dual purpose)
UPS and backup systems

By application

What does AGM mean and how is it different from a standard battery?

AGM stands for Absorbent Glass Mat: the acid is absorbed in glass-fibre mats instead of free liquid. That makes it spill-proof, vibration-resistant and gives roughly twice the cyclic endurance of a conventional lead-acid battery.

Does my start-stop car strictly need an AGM battery?

If the car came with AGM from the factory, replace with AGM: start-stop and regenerative braking require it. If it came with EFB you can keep EFB or upgrade to AGM, never downgrade to conventional.

Can I replace an AGM battery myself?

Yes, but many modern vehicles need the new battery registered in the ECU (BMS) so charging is managed correctly.

How long does an AGM battery last?

4 to 7 years depending on use and climate. Very short trips and extreme heat shorten it; a maintenance charger helps if the vehicle sits unused for weeks.

Other technologies

Compatible batteries

Receive them tomorrow before 5 PM if you order before 6 PM (Spain mainland and Portugal only).

Before you buy: check 3 key points

Although the batteries shown are sourced from information provided by manufacturers, we recommend checking on your current battery:

Dimensions (length × width × height, including terminals and protrusions)
The dimensions shown are the maximum of the battery and include the height of the terminals, small ridges at the base and any lateral protrusions. Measure your current battery completely, from edge to edge. The new one must be the same size or slightly smaller — never larger, it would not fit in the housing.
Positive terminal (left or right viewed from the front — check the battery photo carefully)
Stand facing the battery, with the manufacturer's label facing you and the terminals on top. Locate the terminal marked with +: if it is on your right, it is "positive right"; if it is on your left, it is "positive left". Do not rely on how the battery is mounted in the car — the position is always measured looking only at the battery itself.
Technology (AGM, EFB or conventional — the same as your current battery or higher)
Depending on the manufacturer, the same technology may be labelled differently: AGM may also appear as VRLA, AGM Start-Stop or AGM Deep Cycle. EFB may appear as EF, EFB+ or Enhanced Flooded Battery. Conventional may appear as SLI, Lead-Acid, Wet or Standard. If your vehicle has Start-Stop, the battery must be AGM or EFB — never conventional.

If you have any questions, just ask us and we'll be glad to advise you with no obligation.

This engine comes with an AGM/EFB battery as standard: the car's charging system requires it even without Start-Stop. If in doubt, message us and we will confirm.