# Marine battery Fullriver DC55-12 12V 55Ah 400A AGM ![Marine battery Fullriver DC55-12 12V 55Ah 400A AGM](https://baterias.com/105-home_default/battery-agm-fullriver-dc55-12-12v-55ah.jpg) > Fullriver DC55-12 marine battery 12V 55Ah 400A AGM. DC Series 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-agm-fullriver-dc55-12-12v-55ah - **Language**: en-GB - **Brand**: FULLRIVER - **Reference**: BCOM-FULLRIVER-DC55-12 - **MPN**: DC55-12 - **Price**: 207,90 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULLRIVER | | Reference | DC55-12 | | Model | FULLRIVER DC | | Voltage (V) | 12 V | | Largo | 229 mm | | Ancho | 138 mm | | Alto | 212 mm | | Peso | 17.6 kg | | Tecnología | AGM | | Terminal type | M6 | | Cold cranking amps (EN) | 400 | | Capacity (C20) | 55 Ah (c20) | | Capacity (C5) | 45 Ah (c5) | ## Quick description **Fullriver DC55-12 12V 55Ah 400A** 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 400 A EN-1 📏 Dimensions 229×138×212 mm ⚙️ Technology AGM ⚖️ Weight 17,6 kg 🏷️ Model DC Series ## Description ## Marine battery Fullriver DC55-12 DC 55Ah 400A 12V 12*V* Voltage 55*Ah* Capacity 400*A* Cold cranking 17.60*kg* Weight The **Fullriver DC55-12** with AGM technology is a marine battery with **55 Ah** and **400 A** of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. Measuring 229 × 138 × 212 mm, it is the direct replacement for boats fitted from the factory with a 55 Ah battery of this format. - Sealed: no spills or gases in the locker. - Resistant to humidity and salt air. - AGM: faster recharging and better cycle resistance than a conventional battery. - Ready for starting outboard and inboard engines. ### Will it fit your current battery tray? In terms of format, the Fullriver DC55-12 measures 229 × 138 × 212 mm (length × width × height) and weighs 17.60 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. ### What the Fullriver DC55-12 is for On board, the Fullriver DC55-12 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 17.60 kg and M6 terminals. ### The Fullriver DC55-12: DC range and AGM technology Within the Fullriver catalogue, the **DC** series groups the references designed for this use. The DC55-12 is the 55 Ah model of that family, with the same performance as its siblings in other sizes. 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. ### Fullriver: the maker behind the DC55-12 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. ### Warranty and coverage The Fullriver DC55-12 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### How to make it last longer At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. As a service battery, avoid routine discharges below 50% to extend its cycle life. ### Shipping, delivery and returns Orders placed **before [[ks:cutoff]]** 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 **[[ks:return_days]] 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 DC55-12 model AGM? What does this technology offer? Yes. The DC55-12 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. ### How is the Fullriver DC55-12 battery installed in the vehicle? In most boats 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 (−) 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 — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On boats with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Fullriver DC55-12 battery last? Expected lifespan of the Fullriver DC55-12 is 5 to 8 years in mild-climate boat 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 are the dimensions of the Fullriver DC55-12 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. ### Will the Fullriver DC55-12 battery fit my boat? 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 DC55-12 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the DC55-12 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 — an EFB cannot be replaced with a conventional battery in Start-Stop boats. See the "Equivalents" section to view recommended options at the same performance level. ## Equivalent batteries - [FULLRIVER FFD55-12](https://baterias.com/gb/battery-fullriver-ffd55-12-12v-55ah-350a) ## 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 · 2026-10-20*