# Fulmen FL800 · Start-Stop battery 12V 80Ah 800A ![Fulmen FL800 · Start-Stop battery 12V 80Ah 800A](https://bateriasonline.es/2737-home_default/fulmen-fl800.jpg) > Fulmen FL800: 80 Ah Start-Stop battery, 800 A (EN), 315×175×190 mm, positive terminal on the right, L4 case, EFB. Equivalent to Exide EL800 and Tudor TL800. **Category:** [Start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb) → [Fulmen](https://bateriasonline.es/en/fulmen-batteries) - **Canonical URL**: https://bateriasonline.es/en/fulmen-fl800 - **Language**: en - **Brand**: Fulmen - **Reference**: BOL-FULMEN-FL800 - **EAN**: 3661024045704 - **MPN**: FL800 - **Last updated**: 2026-11-06 ## Technical specifications | Feature | Value | |---|---| | Brand | Fulmen | | Range | FULMEN EFB | | Application | Start-Stop cars | | Technology | EFB | | Voltage | 12 V | | Capacity | 80 Ah | | Cold cranking amps (EN) | 800 A | | Length | 315 mm | | Width | 175 mm | | Height | 190 mm | | Weight | 22.1 kg | | Polarity | Positive terminal on the right | | Case size | L4 (315 × 175 × 190 mm) | ## Quick description Fulmen FL800: Start-Stop battery (EFB) with 12 V, 80 Ah and 800 A cold cranking current, case size L4 (315 × 175 × 190 mm), with the positive terminal on the right. ## Description ## Who the Fulmen FL800 is for The Fulmen FL800 is designed for automatic engine stop and regenerative braking. The FL800 is designed for cars that switch the engine off at every stop and restart it dozens of times per trip. At 80 Ah it sits in the range of compact and mid-size diesels, SUVs and MPVs. The FL800 belongs to the Fulmen FULMEN EFB range. [See all Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries) ## Fulmen FL800 codes and part numbers Shops, garages and catalogues identify the FL800 with these codes: | Commercial reference | FL800 | |---|---| | EAN | 3661024045704 | | Case size (EN) | L4 | | Not to be confused with | Fulmen FL600 (60 Ah, 640 A), Fulmen FL700 (70 Ah, 760 A), Fulmen FB800 (80 Ah, 640 A) | ## Fulmen FL800 vs FK800 and FK820 What sets the FL800 apart from its neighbours in the Fulmen range: | Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight | |---|---|---|---|---|---| | Fulmen FL800 (this one) | 80 Ah | 800 A | 315 × 175 × 190 | right | 22.1 kg | | Fulmen FK800 | 80 Ah | 800 A | 315 × 175 × 190 | right | 23.1 kg | | Fulmen FK820 | 82 Ah | 800 A | 315 × 175 × 190 | right | 23.3 kg | - Fulmen FK800: the same capacity, the same cranking power, the same L4 case, AGM technology. - Fulmen FK820: 2 Ah more, the same cranking power, the same L4 case, AGM technology. ## Equivalents and alternatives to the Fulmen FL800 Alternatives to the FL800 with its dimensions and polarity, in EFB or AGM only: a conventional battery cannot cope with the Start-Stop cycles an EFB is built for. | Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) | |---|---|---|---|---| | Exide EL800 | EFB | 80 Ah | 800 A | 315 × 175 × 190 | | Varta N80 | EFB | 80 Ah | 800 A | 315 × 175 × 190 | | Kronobat PE-80-EFB | EFB | 80 Ah | 800 A | 315 × 175 × 190 | | Tudor TL800 | EFB | 80 Ah | 800 A | 315 × 175 × 190 | | Deta DL800 | EFB | 80 Ah | 800 A | 315 × 175 × 190 | | Varta A6 | AGM | 80 Ah | 800 A | 315 × 175 × 190 | Its Bosch equivalent is the Bosch S4 E11, the same as for the Varta N80. Bosch is not part of our catalogue; we list it so you can compare. ## Inside the FL800: EFB technology Inside, the FL800 uses EFB technology, a reinforced version of the flooded battery. It is the choice for cars with basic Start-Stop. ## Check this before ordering the Fulmen FL800 - The FL800 is an EFB: it suits cars that had an EFB or a conventional battery. If yours had an AGM, fit another AGM. - Cold cranking: 800 A (EN), equal to or higher than the original. - Capacity of the FL800: 80 Ah; the same as your current battery or slightly more is fine. - The FL800 has the positive terminal on the right: compare it with your current battery. - Measure the space: the FL800 takes up 315 × 175 × 190 mm (European case size L4). ## Frequently asked questions about the Fulmen FL800 ### Fulmen FL800 or FK800? Compared with the FL800, the Fulmen FK800 has AGM technology. With the same 80 Ah and 800 A, the difference is the technology. Choose the FK800 if your car left the factory with AGM; if it had EFB, either will do. Both measure 315 × 175 × 190 mm, so they fit the same tray. ### Can the Fulmen FL800 be used in a car with Start-Stop? Yes, the FL800 is an EFB: it suits Start-Stop without brake energy recovery, or cars that already had an EFB. If your car left the factory with an AGM, fit another AGM. ### How much does the Fulmen FL800 weigh? The FL800 weighs 22.1 kg. For reference, the Fulmen FK800 (80 Ah) weighs 23.1 kg. ### Which battery is equivalent to the Fulmen FL800? In EFB or AGM, with its dimensions and polarity: Exide EL800, Varta N80 and Kronobat PE-80-EFB. A conventional battery does not replace the FL800. Its Bosch equivalent is the Bosch S4 E11, the same as for the Varta N80. Bosch is not part of our catalogue; we list it so you can compare. ### What case size is the Fulmen FL800? Case size L4: 315 × 175 × 190 mm. The FL800 fits any standard L4 battery tray such as the Exide EL800. ### Which side is the positive terminal on the Fulmen FL800? The FL800 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you. ### Which charger does the Fulmen FL800 need? An automatic charger with a lead-acid or EFB mode. Modern chargers recognise it like a conventional battery; avoid old ones without voltage control. ## Other options if you are unsure about the FL800 - [More start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb) - [The whole Fulmen range](https://bateriasonline.es/en/fulmen-batteries) - [Exide EL800](https://bateriasonline.es/en/exide-el800) · 80 Ah, 800 A, 315×175×190 mm - [Varta N80](https://bateriasonline.es/en/varta-n80) · 80 Ah, 800 A, 315×175×190 mm --- *bateriasonline.es — Batteries and accessories · 2026-11-10*