# Truck battery Fulmen FF1250 12V 125Ah 850A ![Truck battery Fulmen FF1250 12V 125Ah 850A](https://baterias.com/3710-home_default/battery-fulmen-ff1250-12v-125ah-850a.jpg) > Fulmen FF1250 truck battery 12V 125Ah 850A. Power Pro (HDX) range. Dimensions 349×175×285 mm, + terminal on the right. For heavy-duty fleets. **Category:** [Truck Batteries](https://baterias.com/gb/batteries-for-truck) → [Fulmen](https://baterias.com/gb/fulmen) - **Canonical URL**: https://baterias.com/gb/battery-fulmen-ff1250-12v-125ah-850a - **Language**: en-GB - **Brand**: Fulmen - **Reference**: BCOM-FULMEN-FF1250 - **EAN**: 3661024047449 - **MPN**: FF1250 - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULMEN | | Reference | FF1250 | | Model | FULMEN PowerPRO | | Voltage (V) | 12 V | | Largo | 349 mm | | Ancho | 175 mm | | Alto | 285 mm | | Peso | 31 kg | | Tecnología | Lead-acid | | EAN | 3661024047449 | | Terminal layout | Positive terminal on the right | | Hold down | B00 | | Cold cranking amps (EN) | 850 A | | Capacity (C20) | 125 Ah (c20) | | Case type | D03 | ## Quick description **Fulmen FF1250 12V 125Ah 850A** 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 🔌 Voltage 12 V ⚡ Capacity 125 Ah C20 🔋 Cold cranking 850 A EN-1 📏 Dimensions 349×175×285 mm ⚙️ Technology Lead-acid 🧭 Polarity Positive on the right ⚖️ Weight 31 kg 🏷️ Model FULMEN Power Pro (HDX) ## Description ## Truck battery Fulmen FF1250 PowerPRO 125Ah 850A 12V 12*V* Voltage 125*Ah* Capacity 850*A* Cold cranking 31*kg* Weight With **125 Ah** and **850 A** of cold cranking current (EN), the **Fulmen FF1250** from the **PowerPRO** range is built for professional use in trucks, buses, tractors and heavy machinery. It measures 349 × 175 × 285 mm and the positive terminal on the right, the format sought by anyone replacing a 125 Ah battery in trucks. - Designed for 24 V installations with two batteries in series. - Powerful cold cranking for large-displacement diesel engines. - Heavy Duty construction for intensive professional use. - Conventional lead-acid: the most proven and economical technology. ### What the Fulmen FF1250 is for Designed for trucks, buses, tractors and heavy machinery, the Fulmen FF1250 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 31 kg and B00 hold-down. ### Size, terminals and hold-down of the Fulmen FF1250 The Fulmen FF1250 is made in the 349 × 175 × 285 mm format and weighs 31 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 B00 hold-down, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery. ### Why choose Fulmen batteries With more than a century of history, Fulmen offers complete ranges for cars, trucks, motorcycles and leisure with the industrial quality of the Exide group. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### The Fulmen FF1250: PowerPRO range and conventional lead-acid technology The FF1250 is part of the Fulmen **PowerPRO** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. Conventional lead-acid is the benchmark against which other technologies are compared: good cranking current, great tolerance to alternator charging and the best price per amp-hour. ### Care and maintenance Keep the terminals clean and tight and the battery firmly secured against chassis vibration. On batteries with filler caps, check the electrolyte level and top up only with distilled water. ### Official warranty The Fulmen FF1250 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**. ### Shipping, delivery 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 ### Why does my lorry have two batteries? Most lorries, buses and tractors run on 24 V with two 12 V batteries connected in series. Always replace both at the same time and with the same model: if one is new and the other old, they become unbalanced and both last less. ### What is the service life of the FF1250 model? Expected lifespan of the Fulmen FF1250 is 4 to 6 years in normal lorry use. 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 FF1250 model? Dimensions (length × width × height) are 349×175×285 mm — also written as 349x175x285 mm — 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. ### What polarity does the Fulmen FF1250 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. ### Is the FF1250 valid for my vehicle? 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 — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The FF1250 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Fulmen FF1250? 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 — 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. ## Equivalent batteries - [VARTA J1](https://baterias.com/gb/battery-varta-j1-12v-125ah-720a) - [TUDOR TF1420](https://baterias.com/gb/battery-tudor-tf1420-142ah-850a) - [Q-battery BATTERY-12SEM-135](https://baterias.com/gb/battery-q-battery-12sem-135-12v-135ah) - [Q-battery BATTERY-12TTB-130](https://baterias.com/gb/battery-q-battery-12ttb-130-12v-130ah) - [EXIDE EF1420](https://baterias.com/gb/battery-exide-ef1420-12v-142ah-850a) - [EXIDE EG1250](https://baterias.com/gb/battery-exide-eg1250-12v) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-29*