# Marine battery Fullriver DC40-12 12V 40Ah 275A AGM ![Marine battery Fullriver DC40-12 12V 40Ah 275A AGM](https://baterias.com/101-home_default/battery-agm-fullriver-dc40-12-12v-40ah.jpg) > Fullriver DC40-12 marine battery 12V 40Ah 275A AGM. DC Series range. Dimensions 198×166×174 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-dc40-12-12v-40ah - **Language**: en-GB - **Brand**: FULLRIVER - **Reference**: BCOM-FULLRIVER-DC40-12 - **MPN**: DC40-12 - **Price**: 162,95 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULLRIVER | | Reference | DC40-12 | | Model | FULLRIVER DC | | Voltage (V) | 12 V | | Largo | 198 mm | | Ancho | 166 mm | | Alto | 174 mm | | Peso | 13.4 kg | | Tecnología | AGM | | Terminal type | M6 | | Cold cranking amps (EN) | 275 | | Capacity (C20) | 40 Ah (c20) | | Capacity (C5) | 32 8 Ah (c5) | ## Quick description **Fullriver DC40-12 12V 40Ah 275A** 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 40 Ah C20 🔋 Cold cranking 275 A EN-1 📏 Dimensions 198×166×174 mm ⚙️ Technology AGM ⚖️ Weight 13,4 kg 🏷️ Model DC Series ## Description ## Marine battery Fullriver DC40-12 DC 40Ah 275A 12V 12*V* Voltage 40*Ah* Capacity 275*A* Cold cranking 13.40*kg* Weight The **Fullriver DC40-12 marine battery** offers **12 V**, **40 Ah** and **275 A** of cold cranking current (EN) from the **DC** range with AGM technology, designed for motor and sailing boats, both for engine starting and onboard services. Measuring 198 × 166 × 174 mm, it is the direct replacement for boats fitted from the factory with a 40 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. ### What the Fullriver DC40-12 is for The Fullriver DC40-12 is designed for motor and sailing boats, both for engine starting and onboard services. If it is your starter battery, run the services from a separate battery; if it is a service battery, avoid routinely discharging it beyond 50%. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 13.40 kg and M6 terminals. ### The Fullriver DC40-12: DC range and AGM technology The **DC** is the Fullriver range the DC40-12 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle. 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. ### Dimensions, polarity and mounting It has external dimensions of 198 × 166 × 174 mm and weighs 13.40 kg. It uses M6 terminals, 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 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. All the Fullriver batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### How to make it last longer As a service battery, avoid routine discharges below 50% to extend its cycle life. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections. ### Official warranty The Fullriver DC40-12 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### When you get it and how to return it 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 this battery AGM? What is it for? Yes. AGM (Absorbent Glass Mat) technology, 40 Ah and 12 V: sealed lead-acid, with the electrolyte held in glass fibre. It tolerates heat better and handles more cycles than a conventional battery. ### 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 measurements of the DC40-12 model? Measure the battery tray before ordering: a one-millimetre difference is enough for the hold-down clamp not to close. It measures 198×166×174 mm in length × width × height, with the terminals included in the height. ### Fullriver DC40-12 or Fullriver DC38-12: which one to choose? It is the smaller sister of the DC40-12 in the same Fullriver range. Compared with the DC40-12 it has 2 Ah less and 10 A of cold cranking less. It costs 3,85 € less. Less runtime: only if the original had that capacity and there is no room for more. ### Fullriver DC40-12 or Fullriver DC50-12B: which one to choose? Same family as the DC40-12, one step up in performance. Compared with the DC40-12 it has 10 Ah more and 5 A of cold cranking less. It costs 20,15 € more. More capacity means more runtime: worth it if your equipment takes the size and had that capacity or more; otherwise the DC40-12 does the job. ## Equivalent batteries - [FULLRIVER DC38-12](https://baterias.com/gb/battery-agm-fullriver-dc38-12-12v-38ah) - [FULLRIVER DC50-12B](https://baterias.com/gb/battery-agm-fullriver-dc50-12b-12v-50ah) ## 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 · 2026-11-07*