Fullriver DC40-12 · Marine battery 12V 40Ah 275A AGM
Specifications
| Brand | FULLRIVER |
|---|---|
| Part number | DC40-12 |
| Voltage (V) | 12 |
| Capacity (C20) | 40Ah (c20) |
| Capacity (C5) | 32 8Ah (c5) |
| Technology | AGM |
| Length | 198.00 mm |
| Width | 166.00 mm |
| Height | 174.00 mm |
€162.95
VAT included
4,77/5★★★★★25 reviewsVerified purchases
- ★★★★★Pablo Gutierrez:
Les llamé y me resolvieron varias dudas sobre la instalación de mi batería
- ★★★★★Agustin Suarez:
El servicio, excelente
- ★★★★★Ruben Herrera:
Sin vuestra ayuda no hubiera podido instalar la batería. Gracias
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 designbuilt for boat swell and vibration
- Dual functionstarts the engine and powers onboard services
- Sealed and safemaintenance-free even when the boat rolls
Voltage
12 V
Capacity
40 Ah
Cold cranking
275 A
Dimensions
198×166×174 mm
Technology
AGM
Weight
13,4 kg
Model
DC Series
Marine battery Fullriver DC40-12 DC 40Ah 275A 12V
12VVoltage
40AhCapacity
275ACold cranking
13.40kgWeight
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 and Canary 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.
BCOM-FULLRIVER-DC40-12
Data sheet
- Brand
- FULLRIVER
- Reference
- DC40-12
- Model
- FULLRIVER DC
- Voltage (V)
- 12
- Length
- 198.00 mm
- Width
- 166.00 mm
- Height
- 174.00 mm
- Weight
- 13.40 Kgs
- Technology
- AGM
- Terminal type
- M6
- Cold cranking amps (EN)
- 275
- Capacity (C20)
- 40Ah (c20)
- Capacity (C5)
- 32 8Ah (c5)
Specific References
- MPN
- DC40-12
4,77/5
Verified purchasesLatest verified reviews
★★★★★Pablo Gutierrez
15/07/2026Gracias
Les llamé y me resolvieron varias dudas sobre la instalación de mi batería
★★★★★Agustin Suarez
26/05/2026Todo bien
El servicio, excelente
★★★★★Ruben Herrera
07/04/2026Buen asesoramiento
Sin vuestra ayuda no hubiera podido instalar la batería. Gracias
★★★★★Rodrigo Diaz
07/02/2026Buenos profesionales, gracias por su ayuda
No tengo mas que palabras de agradecimiento, la batería me llego al día siguiente y me asesoraron gratis para la instalación
★★★★★Jose Ramon Rodriguez
22/01/2026Servicio extraordinario
Te atienden fenomenal
★★★★★Mariano Hidalgo
12/01/2026Tiempo de entrega correcto
Me alegra que cumplen con los tiempos de envío
★★★★★Lucas Santiago
07/01/2026Recomiendo
Creo que esta web es la mejor para adquirir tu batería, muy recomdable
★★★★★David Hernandez
06/01/2026Buen precio, calidad y envío
Recibí la bateria de mi coche antes de lo previsto
★★★★★Jose Miguel Nieto
07/10/2025Muy útil su ayuda
Les llamé y me resolvieron varias dudas sobre la instalación de mi bateria
Comparison: Fullriver DC40-12 vs equivalents
The Fullriver DC40-12 is interchangeable with these equivalent references: DC38-12 (Fullriver).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fullriver
DC40-12
This battery
|
12V 40Ah 275A | AGM | €162.95 |
Fullriver
DC38-12
|
12V 38Ah 265A | AGM | €159.10 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
Recommended accessories
How to change the battery
Guide to replace a marine battery (cranking or house) in 20-30 minutes. Moisture and vibration in marine environments require reinforced hold-downs and sealed copper terminals.
Step 1. Prepare the vehicle
Park on a flat surface, switch off the engine and remove the key. Make sure all lights and electrical accessories are off. Wait 1-2 minutes before starting.
Step 2. Locate the battery compartment
Usually under the passenger bench, engine room or a dedicated ventilated compartment. Verify the compartment is dry and well ventilated before opening.
Step 3. Disconnect the negative (−) terminal
Use the 10 mm wrench to loosen the negative cable nut (black, marked −) and remove the cable from the post. Move it aside so it cannot touch any bodywork.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Marine batteries are heavy (15-50 kg). If it has rope handles, use them; otherwise have a carry strap ready. Secure the new one with metal hold-downs (not plastic) to resist sea-state vibration.
Step 6. Install the new battery
Place the battery in the same orientation as the old one (positive terminal on the same side). Tighten the hold-down clamp firmly.
Step 7. Connect the cables
Connect the positive (+) terminal first, then the negative (−). Tighten the nuts with the wrench until each terminal does not move. Apply anti-spark grease if you have any.
Step 8. Verify circuit + water protection
Apply dielectric grease on terminals to prevent salt-air corrosion. Check the engine charging circuit delivers 13.8-14.4 V at 2,000 rpm.
Frequently asked questions
Is this battery AGM? What is it for?
Yes. The DC40-12 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 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 this page. 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 DC40-12 model?
Expected lifespan of the Fullriver DC40-12 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 measurements of the DC40-12 model?
Dimensions (length × width × height) are 198×166×174 mm — also written as 198x166x174 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 DC40-12 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 DC40-12 typically fits a wide range of European vehicles thanks to its standard DIN case format.
What are the equivalents of the DC40-12 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.
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