# Marine battery Fullriver DC335-6 6V 335Ah 1300A AGM ![Marine battery Fullriver DC335-6 6V 335Ah 1300A AGM](https://baterias.com/97-home_default/battery-agm-fullriver-dc335-6-6v-335ah.jpg) > Fullriver DC335-6 marine battery 6V 335Ah 1300A AGM. DC Series range. Dimensions 295×178×365 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-dc335-6-6v-335ah - **Language**: en-GB - **Brand**: FULLRIVER - **Reference**: BCOM-FULLRIVER-DC335-6 - **MPN**: DC335-6 - **Price**: 553,40 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULLRIVER | | Reference | DC335-6 | | Model | FULLRIVER DC | | Voltage (V) | 6 V | | Largo | 295 mm | | Ancho | 178 mm | | Alto | 366 mm | | Peso | 47.8 kg | | Tecnología | AGM | | Terminal type | DT | | Cold cranking amps (EN) | 1300 | | Capacity (C20) | 335 Ah (c20) | | Capacity (C5) | 274 Ah (c5) | ## Quick description **Fullriver DC335-6 6V 335Ah 1300A** 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 6 V ⚡ Capacity 335 Ah C20 🔋 Cold cranking 1300 A EN-1 📏 Dimensions 295×178×365 mm ⚙️ Technology AGM ⚖️ Weight 47,8 kg 🏷️ Model DC Series ## Description ## Marine battery Fullriver DC335-6 DC 335Ah 1,300A 6V 6*V* Voltage 335*Ah* Capacity 1,300*A* Cold cranking 47.80*kg* Weight With **335 Ah** at **6 V** and **1,300 A** of cold cranking current (EN), the **Fullriver DC335-6** from the **DC** range is built for motor and sailing boats, both for engine starting and onboard services. Measuring 295 × 178 × 366 mm, it is the direct replacement for boats fitted from the factory with a 335 Ah battery of this format. - AGM: faster recharging and better cycle resistance than a conventional battery. - Ready for starting outboard and inboard engines. - Sealed: no spills or gases in the locker. - Resistant to humidity and salt air. ### Size, terminals and hold-down of the Fullriver DC335-6 It has external dimensions of 295 × 178 × 366 mm and weighs 47.80 kg. It uses DT 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 DC335-6 is for With 335 Ah, the Fullriver DC335-6 covers motor and sailing boats, both for engine starting and onboard services. At the end of the season, charge it fully before winter storage. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 47.80 kg and DT terminals. ### The Fullriver DC335-6: DC range and AGM technology Within the Fullriver catalogue, the **DC** series groups the references designed for this use. The DC335-6 is the 335 Ah model of that family, with the same performance as its siblings in other sizes. In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery. ### Why choose Fullriver batteries Fullriver specialises in deep-cycle AGM batteries for mobility, marine, solar and traction. Its DC and HC series are known for their tolerance to deep discharge and long cycle life. We guarantee that every Fullriver arrives new, charged and with the manufacturer's full warranty. ### Warranty and coverage The Fullriver DC335-6 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### Usage and maintenance tips Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. 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 Fullriver DC335-6 an AGM battery and what are the benefits of AGM? Yes. The DC335-6 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 DC335-6 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 DC335-6 battery last? Expected lifespan of the Fullriver DC335-6 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 DC335-6 battery? Dimensions (length × width × height) are 295×178×365 mm — also written as 295x178x365 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 DC335-6 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 DC335-6 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the DC335-6 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. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2015. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-14*