# Start-Stop battery Fulmen FK620 12V 62Ah 680A AGM ![Start-Stop battery Fulmen FK620 12V 62Ah 680A AGM](https://baterias.com/3753-home_default/battery-fulmen-fk620-12v-62ah-680a.jpg) > Fulmen FK620 Start-Stop battery 12V 62Ah 680A AGM. Dimensions 242Γ—175Γ—190 mm, + terminal on the right. For Start-Stop vehicles. **Category:** [Car batteries equipped with start stop system](https://baterias.com/gb/car-batteries-equipped-with-start-stop-system) β†’ [Fulmen](https://baterias.com/gb/fulmen) - **Canonical URL**: https://baterias.com/gb/battery-fulmen-fk620-12v-62ah-680a - **Language**: en-GB - **Brand**: Fulmen - **Reference**: BCOM-FULMEN-FK620 - **EAN**: 3661024047395 - **MPN**: FK620 - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULMEN | | Reference | FK620 | | Model | FULMEN AGM | | Voltage (V) | 12 V | | Largo | 242 mm | | Ancho | 175 mm | | Alto | 190 mm | | Peso | 17.9 kg | | TecnologΓ­a | AGM | | EAN | 3661024047395 | | Terminal layout | Positive terminal on the right | | Hold down | B13 | | Cold cranking amps (EN) | 680 A | | Capacity (C20) | 62 Ah (c20) | | Case type | L02 | ## Quick description **Fulmen FK620 12V 62Ah 680A** is a dedicated Start-Stop battery with AGM/EFB technology. Withstands intensive cycling at traffic-light stops (hundreds of cranks per day), recharges quickly while driving and keeps comfort loads alive during long idle periods. ## Why this Start-Stop battery? - **Designed for Start-Stop** built for the intensive cycling of modern cars - **2 to 3 times longer life** vs fitting a cheap conventional battery - **Fast recovery** recharges in minutes once the engine is running πŸ”Œ Voltage 12 V ⚑ Capacity 62 Ah C20 πŸ”‹ Cold cranking 680 A EN-1 πŸ“ Dimensions 242Γ—175Γ—190 mm βš™οΈ Technology AGM 🧭 Polarity Positive on the right βš–οΈ Weight 17,9 kg 🏷️ Model FULMEN AGM ## Description ## Start-Stop battery Fulmen FK620 62Ah 680A 12V 12*V* Voltage 62*Ah* Capacity 680*A* Cold cranking 17.90*kg* Weight The **Fulmen FK620 Start-Stop battery** offers **12 V**, **62 Ah** and **680 A** of cold cranking current (EN) with AGM technology, and is built for cars with Start-Stop, regenerative braking and heavy electrical loads. It replaces the original battery without adaptation in Start-Stop cars with a 242 Γ— 175 Γ— 190 mm format: same 62 Ah capacity and the positive terminal on the right. - Compatible with regenerative braking and energy management (BMS). - Up to three times the cycles of a conventional battery. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Withstands hundreds of starts a day without degrading. ### What the Fulmen FK620 is for The Fulmen FK620 is designed for cars with Start-Stop, regenerative braking and heavy electrical loads. If your car was fitted with an AGM or EFB battery, always replace it with the same technology: a conventional model would degrade within months. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 17.90 kg and B13 hold-down. ### Dimensions, polarity and mounting The Fulmen FK620 is made in the 242 Γ— 175 Γ— 190 mm format and weighs 17.90 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B13 hold-down, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### Technology inside the Fulmen FK620 The FK620 is one of the Fulmen references for this type of use; it shares the same manufacturing and quality-control criteria as the rest of the brand's catalogue. AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly. ### Fulmen: the maker behind the FK620 Fulmen is the historic French brand of the Exide group: batteries made on the same lines and with the same technology as original equipment, widely used by workshops across Europe. All the Fulmen batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Warranty and coverage The Fulmen FK620 comes with the **manufacturer's official warranty**. To keep it valid, always fit the same technology as the original battery (AGM or EFB) and register the replacement if your vehicle requires it. ### Care and maintenance Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. In a Start-Stop car the battery is controlled by the ECU; after replacing it, the new battery may need to be registered so the system adjusts charging. ### Delivery times and returns Same-day dispatch from our warehouse for in-stock orders placed **before 6:00 pm**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **14 days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### Is the Fulmen FK620 an AGM battery and what are the benefits of AGM? Yes. The FK620 from Fulmen uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for cars with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### Is this battery compatible with Start-Stop systems? Yes. As AGM technology it is designed for Start-Stop vehicles. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. EFB is recommended for basic Start-Stop; AGM is recommended when regenerative braking is also present, thanks to its higher cycle capability. It works straight out of the box β€” on most modern vehicles registering the battery via OBD is recommended so the alternator automatically applies the optimal charging profile. ### What should I bear in mind when fitting this Start-Stop battery? In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on our blog. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (βˆ’) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation β€” with positive on the right match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. Also, the negative terminal usually carries a battery sensor (IBS): undo the cable at the terminal nut without removing the sensor. Always replace it with the same technology (AGM or EFB) or higher: a conventional battery wears out within months with Start-Stop. ### How long does the Fulmen FK620 battery last? Expected lifespan of the Fulmen FK620 is 5 to 8 years in mild-climate car use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What size is this battery? Dimensions (length Γ— width Γ— height) are 242Γ—175Γ—190 mm β€” also written as 242x175x190 mm and correspond to the European L2 case size β€” following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### What polarity does the Fulmen FK620 battery have? Polarity: positive on the right. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ### Will the Fulmen FK620 battery fit my car? Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year β€” we reply during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). The FK620 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the FK620 model? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology β€” an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level. ### Fulmen FK620 or Tudor TK620: which one to choose? It is the verified Tudor equivalent for the FK620 tray. Compared with the FK620 it has the same Ah and cranking power. It costs €96.80 more. Decide by price, brand preference and availability: both fit and crank the same. ### Fulmen FK620 or Exide EK620: which one to choose? It is the verified Exide equivalent for the FK620 tray. Compared with the FK620 it has the same Ah and cranking power. It costs €94.40 more. Decide by price, brand preference and availability: both fit and crank the same. ### Why choose AGM instead of EFB for my Start-Stop car? AGM (Absorbent Glass Mat) technology uses absorbent fibreglass that retains the electrolyte, eliminating leaks and allowing up to 3Γ— more charge/discharge cycles than a conventional battery. It is the recommended option when the car has advanced Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Withstands tilted positions, high vibration and extreme temperatures better than EFB. The Fulmen FK620 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Do I need to register the Fulmen FK620 on the car after installation? On most cars it is not strictly necessary β€” the alternator detects the new battery and adapts the charge automatically. It is recommended to register the battery via OBD so that the alternator applies the optimal charging profile from the first minute and extends the battery life as much as possible (especially on brands with sophisticated BMS: BMW, Mercedes, Audi, Volvo, Land Rover). Any workshop with an OBD scanner (~10-15 € labour) does it in 5 minutes. DIY apps: VCDS / Carista (VAG), Bimmercode (BMW), iCarsoft. If you do not register, the car will still start correctly β€” the alternator just takes a few days to adjust the profile. The Fulmen FK620 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [EXIDE EK620](https://baterias.com/gb/battery-exide-ek620-12v-62ah-680a) - [TUDOR TK620](https://baterias.com/gb/battery-tudor-tk620-12v-62ah-680a) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team β€” automotive battery specialists since 2012. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-11-01*