Fullriver DC120-12B · Marine battery 12V 120Ah 760A AGM
Specifications
| Brand | FULLRIVER |
|---|---|
| Part number | DC120-12B |
| Voltage (V) | 12 |
| Capacity (C20) | 120Ah (c20) |
| Capacity (C5) | 98Ah (c5) |
| Technology | AGM |
| Length | 331.00 mm |
| Width | 175.00 mm |
| Height | 218.00 mm |
€422.20
VAT included
4,75/5★★★★★26 reviewsVerified purchases
- ★★★★Alberto Gil:
Me ayudaron a elegir mi batería y, además, me ayudaron en la instalación
- ★★★★★Luis Prieto:
Estupenda pagina web
- ★★★★★Victor Manuel Nieto:
Esta web tiene un gran servicio al cliente.
Fullriver DC120-12B 12V 120Ah 760A 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
120 Ah
Cold cranking
760 A
Dimensions
331×175×218 mm
Technology
AGM
Weight
36,5 kg
Model
DC Series
Marine battery Fullriver DC120-12B DC 120Ah 760A 12V
12VVoltage
120AhCapacity
760ACold cranking
36.50kgWeight
With 120 Ah at 12 V and 760 A of cold cranking current (EN), the Fullriver DC120-12B from the DC range is built for motor and sailing boats, both for engine starting and onboard services. Measuring 331 × 175 × 218 mm, it is the direct replacement for boats fitted from the factory with a 120 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 DC120-12B is for
On board, the Fullriver DC120-12B provides 120 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 36.50 kg and M8 terminals.
Will it fit your current battery tray?
In terms of format, the Fullriver DC120-12B measures 331 × 175 × 218 mm (length × width × height) and weighs 36.50 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.
The Fullriver DC120-12B: DC range and AGM technology
The DC120-12B is part of the Fullriver DC range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.
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.
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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.
Manufacturer's warranty
The Fullriver DC120-12B 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
As a service battery, avoid routine discharges below 50% to extend its cycle life. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators.
When you get it and how to return it
Order before 6:00 pm 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 14 days to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.
BCOM-FULLRIVER-DC120-12B
Data sheet
- Brand
- FULLRIVER
- Reference
- DC120-12B
- Model
- FULLRIVER DC
- Voltage (V)
- 12
- Length
- 331.00 mm
- Width
- 175.00 mm
- Height
- 218.00 mm
- Weight
- 36.50 Kgs
- Technology
- AGM
- Terminal type
- M8
- Cold cranking amps (EN)
- 760
- Capacity (C20)
- 120Ah (c20)
- Capacity (C5)
- 98Ah (c5)
Specific References
- MPN
- DC120-12B
4,75/5
Verified purchasesLatest verified reviews
★★★★★Alberto Gil
25/07/2026Me ayudaron a poner la batería
Me ayudaron a elegir mi batería y, además, me ayudaron en la instalación
★★★★★Luis Prieto
03/01/2026Muy bueno
Estupenda pagina web
★★★★★Victor Manuel Nieto
03/01/2026El servicio es insuperable
Esta web tiene un gran servicio al cliente.
★★★★★Sebastian Pastor
02/01/2026Gran asesoría
Fueron de gran ayuda al momento de elegir la batería y de instalarla.
★★★★★Alberto Alonso
13/10/2025Muchas gracias por la ayuda
Me ayudaron a elegir mi bateria y, además, me ayudaron en la instalación
Comparison: Fullriver DC120-12B vs equivalents
The Fullriver DC120-12B is interchangeable with these equivalent references: DC115-12B (Fullriver).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fullriver
DC120-12B
This battery
|
12V 120Ah 760A | AGM | €422.20 |
Fullriver
DC115-12B
|
12V 115Ah 605A | AGM | €383.30 |
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 the Fullriver DC120-12B an AGM battery and what are the benefits of AGM?
Yes. The DC120-12B 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 is the Fullriver DC120-12B 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 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.
How long does the Fullriver DC120-12B battery last?
Expected lifespan of the Fullriver DC120-12B 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 DC120-12B battery?
Dimensions (length × width × height) are 331×175×218 mm — also written as 331x175x218 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.
Is the DC120-12B valid for my vehicle?
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 DC120-12B typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Fullriver DC120-12B?
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.
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