# Marine battery Fullriver DC65-12B 12V 65Ah 490A AGM

![Marine battery Fullriver DC65-12B 12V 65Ah 490A AGM](https://baterias.com/109-home_default/battery-agm-fullriver-dc65-12b-12v-65ah.jpg)

> Fullriver DC65-12B marine battery 12V 65Ah 490A AGM. DC Series range. Dimensions 261×172×187 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-dc65-12b-12v-65ah
- **Language**: en-GB
- **Brand**: FULLRIVER
- **Reference**: BCOM-FULLRIVER-DC65-12B
- **MPN**: DC65-12B
- **Price**: 267,90 €
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | FULLRIVER |
| Reference | DC65-12 B |
| Model | FULLRIVER DC |
| Voltage (V) | 12 V |
| Largo | 261 mm |
| Ancho | 171.5 mm |
| Alto | 186.5 mm |
| Peso | 21.3 kg |
| Tecnología | AGM |
| Terminal type | M8 |
| Cold cranking amps (EN) | 490 |
| Capacity (C20) | 65 Ah (c20) |
| Capacity (C5) | 53 Ah (c5) |

## Quick description

**Fullriver DC65-12B 12V 65Ah 490A** 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
65 Ah C20

🔋 Cold cranking
490 A EN-1

📏 Dimensions
261×172×187 mm

⚙️ Technology
AGM

⚖️ Weight
21,3 kg

🏷️ Model
DC Series

## Description

## Marine battery Fullriver DC65-12B DC 65Ah 490A 12V

12*V* Voltage
65*Ah* Capacity
490*A* Cold cranking
21.30*kg* Weight

With **65 Ah** at **12 V** and **490 A** of cold cranking current (EN), the **Fullriver DC65-12B** from the **DC** range is built for motor and sailing boats, both for engine starting and onboard services. It replaces the original battery without adaptation in boats with a 261 × 171 × 186 mm format: same 65 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 DC65-12B is for

The Fullriver DC65-12B 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 21.30 kg and M8 terminals.

### The Fullriver DC65-12B: DC range and AGM technology

The **DC** is the Fullriver range the DC65-12B 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.
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.

### Dimensions, polarity and mounting

It has external dimensions of 261 × 171 × 186 mm and weighs 21.30 kg. It uses M8 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.

### Fullriver: the maker behind the DC65-12B

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.

### 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. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections.

### Official warranty

The Fullriver DC65-12B 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

Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.

## Frequently asked questions

### Is the DC65-12B model AGM? What does this technology offer?

Yes. The DC65-12B 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 do I change this battery step by step?

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.

### What is the service life of the DC65-12B model?

Expected lifespan of the Fullriver DC65-12B 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 DC65-12B battery?

Dimensions (length × width × height) are 261×172×187 mm — also written as 261x172x187 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 DC65-12B 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 DC65-12B typically fits a wide range of European vehicles thanks to its standard DIN case format.

### Which batteries are equivalent to the Fullriver DC65-12B?

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 2012.

→ https://baterias.com/gb/technical-team

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*baterias.com — Automotive batteries · 2026-10-22*