# Marine battery Fullriver FFD55-12 12V 55Ah 350A AGM ![Marine battery Fullriver FFD55-12 12V 55Ah 350A AGM](https://baterias.com/3188-home_default/battery-fullriver-ffd55-12-12v-55ah-350a.jpg) > Fullriver FFD55-12 marine battery 12V 55Ah 350A AGM. FF range. Dimensions 229×138×212 mm. Cranking and house duties. **Category:** [Boat Batteries](https://baterias.com/gb/boat-batteries) → [FULLRIVER](https://baterias.com/gb/fullriver) - **Canonical URL**: https://baterias.com/gb/battery-fullriver-ffd55-12-12v-55ah-350a - **Language**: en-GB - **Brand**: FULLRIVER - **Reference**: BCOM-FULLRIVER-FFD55-12 - **MPN**: FFD55-12 - **Price**: 337,90 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULLRIVER | | Reference | FFD55-12 | | Model | Full Force Series | | Voltage (V) | 12 V | | Largo | 229 cm | | Ancho | 138 cm | | Alto | 212 cm | | Peso | 16.4 kg | | Tecnología | AGM | | EAN | 131847 | | Terminal type | M6 | | Cold cranking amps (EN) | 350 | | Capacity (C20) | 55 | | Case type | 22 NF | | Capacity (C5) | 44 Ah (c5) | ## Quick description **Fullriver FFD55-12 12V 55Ah 350A** is a marine battery with reinforced anti-vibration case for moorings and offshore use. Tolerates the typical daily cycles on a boat (engine start + night-time services such as lights, sonar, fridge) and holds voltage even when the hull is rolling in open sea. ## Why this marine battery? - **Marine design** built for boat swell and vibration - **Dual function** starts the engine and powers onboard services - **Sealed and safe** maintenance-free even when the boat rolls 🔌 Voltage 12 V ⚡ Capacity 55 Ah C20 🔋 Cold cranking 350 A EN-1 📏 Dimensions 229×138×212 mm ⚙️ Technology AGM ⚖️ Weight 16,4 kg 🏷️ Model FULLRIVER FF ## Description ## Marine battery Fullriver FFD55-12 Full Force Series 55Ah 350A 12V 12*V* Voltage 55*Ah* Capacity 350*A* Cold cranking 16.40*kg* Weight The **Fullriver FFD55-12** with AGM technology is a marine battery with **55 Ah** and **350 A** of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. It replaces the original battery without adaptation in boats with a 229 × 138 × 212 mm format: same 55 Ah capacity. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Reinforced case against vibration and swell. - Powers onboard services: lights, sounder, GPS, fridge. - Tolerates the daily cycling of a boat in season. ### What the Fullriver FFD55-12 is for On board, the Fullriver FFD55-12 provides 55 Ah with a case reinforced against vibration and swell. Keep the terminals clean and protected from salt humidity. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 16.40 kg and M6 terminals. ### Dimensions, polarity and mounting The Fullriver FFD55-12 is made in the 229 × 138 × 212 mm format and weighs 16.40 kg. It uses M6 terminals, 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. ### The Fullriver FFD55-12: Full Force Series range and AGM technology The FFD55-12 is part of the Fullriver **Full Force Series** 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 (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### What Fullriver does differently With its own plants and a catalogue focused on high-performance AGM, Fullriver is a familiar brand in power wheelchairs, boats and photovoltaic systems that need thousands of cycles. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### Manufacturer's warranty The Fullriver FFD55-12 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### Care and maintenance At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections. ### When you get it and how to return it 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 Fullriver FFD55-12 an AGM battery and what are the benefits of AGM? Yes. The FFD55-12 from Fullriver 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 boats with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### In what position can it be installed on the boat? Being AGM, it is sealed and does not spill: it can be mounted tilted (never upside down) and copes well with vibration and wave impacts. Secure it firmly and keep the terminals away from water. ### What are the dimensions of the Fullriver FFD55-12 battery? Dimensions (length × width × height) are 229×138×212 mm — also written as 229x138x212 mm — following the European DIN standard. Always measure the space in your boat before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ## Equivalent batteries - [FULLRIVER DC55-12](https://baterias.com/gb/battery-agm-fullriver-dc55-12-12v-55ah) ## 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*