# Truck battery Fulmen FJ050C 12V 50Ah 800A AGM ![Truck battery Fulmen FJ050C 12V 50Ah 800A AGM](https://baterias.com/3736-home_default/battery-fulmen-fj050c-12v-50ah-800a.jpg) > Fulmen FJ050C truck battery 12V 50Ah 800A AGM. Dimensions 260Γ—173Γ—206 mm, + terminal on the left. For heavy-duty fleets. **Category:** [Batteries for Heavy Machinery](https://baterias.com/gb/batteries-for-heavy-machinery) β†’ [Fulmen](https://baterias.com/gb/fulmen) - **Canonical URL**: https://baterias.com/gb/battery-fulmen-fj050c-12v-50ah-800a - **Language**: en-GB - **Brand**: Fulmen - **Reference**: BCOM-FULMEN-FJ050C - **EAN**: 3661024046664 - **MPN**: FJ050C - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULMEN | | Reference | FJ050 C | | Model | FULMEN PowerPRO Agriculture and Construction | | Voltage (V) | 12 V | | Largo | 260 mm | | Ancho | 173 mm | | Alto | 206 mm | | Peso | 17.9 kg | | TecnologΓ­a | AGM | | EAN | 3661024046664 | | Terminal layout | Positive terminal on the left | | Hold down | B07 | | Cold cranking amps (EN) | 800 A | | Capacity (C20) | 50 Ah (c20) | | Case type | G34 | ## Quick description **Fulmen FJ050C 12V 50Ah 800A** is an SHD (Super Heavy Duty) truck battery for intensive professional use. Vibration-resistant, withstands long cold-diesel cranks and deep discharges during parking with active loads (tachograph, refrigeration, heater). ## Why this truck battery? - **True Heavy Duty** built for intensive professional use - **Long cold-diesel cranks** reliable even in extreme cold - **Powers services at idle** tachograph, heater and lights with engine off πŸ”Œ Voltage 12 V ⚑ Capacity 50 Ah C20 πŸ”‹ Cold cranking 800 A EN-1 πŸ“ Dimensions 260Γ—173Γ—206 mm βš™οΈ Technology AGM 🧭 Polarity Positive on the left βš–οΈ Weight 17,9 kg 🏷️ Model FULMEN PowerPRO Agriculture and Construction ## Description ## Truck battery Fulmen FJ050C PowerPRO y Construction 50Ah 800A 12V 12*V* Voltage 50*Ah* Capacity 800*A* Cold cranking 17.90*kg* Weight The **Fulmen FJ050C truck battery** is rated at **12 V**, **50 Ah** and **800 A** of cold cranking current (EN) from the **PowerPRO y Construction** range, and is prepared for trucks, buses, tractors and heavy machinery. It replaces the original battery without adaptation in trucks with a 260 Γ— 173 Γ— 206 mm format: same 50 Ah capacity and the positive terminal on the left. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Heavy Duty construction for intensive professional use. - Powerful cold cranking for large-displacement diesel engines. - Designed for 24 V installations with two batteries in series. ### What the Fulmen FJ050C is for Designed for trucks, buses, tractors and heavy machinery, the Fulmen FJ050C withstands constant chassis vibration and discharges during stops with active loads. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 17.90 kg and B07 hold-down. ### The Fulmen FJ050C: PowerPRO y Construction range and AGM technology The FJ050C is part of the Fulmen **PowerPRO y Construction** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. 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. ### Dimensions, polarity and mounting It has external dimensions of 260 Γ— 173 Γ— 206 mm and weighs 17.90 kg. The positive terminal on the left 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 B07 hold-down, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### What Fulmen does differently 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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### How to make it last longer During rest stops with active loads, avoid repeated deep discharges: they shorten the life of any starter battery. In 24 V installations, check periodically that both batteries show the same voltage; an imbalance means one is failing. ### Official warranty The Fulmen FJ050C comes with the **manufacturer's official warranty** against manufacturing defects. An important note for commercial vehicles: most trucks use **two batteries connected in series** (24 V installation). If you replace only one, the new battery works alongside the old one, which has already lost capacity; that imbalance shortens its life and the manufacturer may treat it as misuse. Always replace **both at the same time**. ### Delivery times and returns Orders placed **before 6:00 pm** with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have **14 days** to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships. ## Frequently asked questions ### Is the Fulmen FJ050C an AGM battery and what are the benefits of AGM? Yes. The FJ050C 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 trucks with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### Is the Fulmen FJ050C battery suitable for Start-Stop? 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. ### How long does the Fulmen FJ050C battery last? Expected lifespan of the Fulmen FJ050C is 5 to 7 years in lorry use, even with high power draw while parked. 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 are the measurements of the FJ050C model? Dimensions (length Γ— width Γ— height) are 260Γ—173Γ—206 mm β€” also written as 260x173x206 mm β€” following the European DIN standard. Always measure the space in your truck before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### On which side is the positive of the FJ050C model? Polarity: positive on the left. 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 FJ050C battery fit my truck? 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 FJ050C typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Fulmen FJ050C? 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 trucks. See the "Equivalents" section to view recommended options at the same performance level. ### When do I need an AGM battery like this one? 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 truck 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 FJ050C is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Will my truck recognise the new battery automatically? On most trucks 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 truck will still start correctly β€” the alternator just takes a few days to adjust the profile. The Fulmen FJ050C ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [EXIDE EP450](https://baterias.com/gb/battery-exide-ep450-12v-50ah-750a) - [EXIDE EM1000](https://baterias.com/gb/battery-exide-em1000-12v-50ah-800a) ## 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· 2026-11-02*