# Fulmen batteries

> Over 130 Fulmen 12V batteries for cars, trucks and Start-Stop EFB and AGM, such as FB800 or FK800, from 9 to 235 Ah. Search by VIN and 14-day returns.

**Category:** [Beginning](https://bateriasonline.es/en/) → [Battery brands](https://bateriasonline.es/en/battery-brands)

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## Description

Fulmen lead-acid, EFB and AGM batteries for cars and heavy vehicles; find the one that fits your vehicle by VIN or model.
Only looking for your car? They are grouped in [Fulmen car batteries](https://bateriasonline.es/en/fulmen-car-batteries). This page shows them all, including truck and commercial vehicle models.

Every 12 V Fulmen battery we sell, ready to compare: cars with or without Start-Stop, auxiliary backup units and heavy, farm and construction vehicles.
Use the filters for capacity (Ah), cold cranking (CCA), dimensions and positive terminal position to keep only the models that fit your vehicle, then check the product page for the exact figures.

## How to pick your Fulmen battery

Always start from what your vehicle came with from the factory. With Start-Stop, the technology is not optional: a system designed for EFB needs EFB or AGM, and one designed for AGM needs AGM. Without Start-Stop, Formula or Standard are the benchmark among our [car batteries](https://bateriasonline.es/en/car-batteries). If in doubt, note the figures printed on your current battery label and check them against each product page before adding it to your basket.

## Figures worth comparing

- **Capacity (Ah)**: the same as the original or slightly higher.
- **Cold cranking (CCA, EN standard)**: never below the factory value; diesels and cold regions benefit from some headroom.
- **Dimensions**: length, width and height must fit the tray and match the bottom hold-down.
- **Polarity**: check which side the positive terminal sits on; if it does not match, the cables will not reach.

For trucks, tractors and site machines, look at the PRO family in [truck batteries](https://bateriasonline.es/en/truck-agricultural-batteries): the EFB+ and Gel versions are built for hard cycling and loads drawn with the engine off.

## Frequently asked questions

### Can I fit an AGM if my car had an EFB?

Yes, an AGM can replace an EFB. Not the other way round: in a car that left the factory with AGM, an EFB would wear out early.

### What is the Start-Stop Auxiliary for?

It is a small battery that keeps the electronics powered while the engine stops and restarts. You will find it under [auxiliary batteries](https://bateriasonline.es/en/auxiliary-backup-batteries); choose it by size and terminal type.

### Where can I read more about the brand?

The [Fulmen](https://bateriasonline.es/en/fulmen-batteries) brand page covers its technologies and every range in detail.
**Related guides:** helps you check that the battery fits your car.
- [Varta, Bosch, Exide and Tudor car battery equivalents table](https://bateriasonline.es/en/varta-bosch-exide-tudor-car-battery-equivalents)

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*bateriasonline.es — Batteries and accessories · 2026-11-10*