Fullriver DC120-12A · Marine battery 12V 120Ah 750A AGM
Specifications
| Brand | FULLRIVER |
|---|---|
| Part number | DC120-12A |
| Voltage (V) | 12 |
| Capacity (C20) | 120Ah (c20) |
| Capacity (C5) | 98Ah (c5) |
| Technology | AGM |
| Length | 407.00 mm |
| Width | 174.00 mm |
| Height | 240.00 mm |
€441.90
VAT included
5,00/5★★★★★5 reviewsVerified purchases
- ★★★★★Andres Romero:
Me ayudaron a elegir mi batería y, además, me ayudaron en la instalación
- ★★★★★Marc Crespo:
Esta web tiene un gran servicio al cliente.
- ★★★★★Hector Aguilar:
Fueron de gran ayuda al momento de elegir la batería y de instalarla.
Fullriver DC120-12A 12V 120Ah 750A is a marine battery, vibration- and deep-discharge resistant, suitable both for outboard engine starting and for onboard auxiliary services (navigation lights, GPS, sonar, fridge). Sealed and maintenance-free.
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
750 A
Dimensions
407×171×240 mm
Technology
AGM
Weight
38,2 kg
Model
DC Series
Marine battery Fullriver DC120-12A DC 120Ah 750A 12V
12VVoltage
120AhCapacity
750ACold cranking
38.20kgWeight
The Fullriver DC120-12A marine battery offers 12 V, 120 Ah and 750 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. It replaces the original battery without adaptation in boats with a 407 × 174 × 240 mm format: same 120 Ah capacity.
- Powers onboard services: lights, sounder, GPS, fridge.
- Tolerates the daily cycling of a boat in season.
- AGM technology: absorbed electrolyte, no spills, can be mounted at an angle.
- Reinforced case against vibration and swell.
What the Fullriver DC120-12A is for
With 120 Ah, the Fullriver DC120-12A 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 38.20 kg and M8 terminals.
Will it fit your current battery tray?
It has external dimensions of 407 × 174 × 240 mm and weighs 38.20 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 DC120-12A: DC range and AGM technology
Within the Fullriver catalogue, the DC series groups the references designed for this use. The DC120-12A is the 120 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
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.
Manufacturer's warranty
The Fullriver DC120-12A 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
As a service battery, avoid routine discharges below 50% to extend its cycle life. At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up.
Delivery times and returns
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-DC120-12A
Data sheet
- Brand
- FULLRIVER
- Reference
- DC120-12A
- Model
- FULLRIVER DC
- Voltage (V)
- 12
- Length
- 407.00 mm
- Width
- 174.00 mm
- Height
- 240.00 mm
- Weight
- 38.20 Kgs
- Technology
- AGM
- Terminal type
- M8
- Cold cranking amps (EN)
- 750
- Capacity (C20)
- 120Ah (c20)
- Capacity (C5)
- 98Ah (c5)
Specific References
- MPN
- DC120-12A
5,00/5
Verified purchasesLatest verified reviews
★★★★★Andres Romero
23/07/2026Muchas gracias por la ayuda
Me ayudaron a elegir mi batería y, además, me ayudaron en la instalación
★★★★★Marc Crespo
15/02/2026Servicio increíble
Esta web tiene un gran servicio al cliente.
★★★★★Hector Aguilar
22/01/2026Te indican cómo hacer la instalación
Fueron de gran ayuda al momento de elegir la batería y de instalarla.
★★★★★Antonio Martin
08/01/2026Super bien
Estupenda pagina web
★★★★★Enrique Vega
11/10/2025Gracias por la ayuda
Me ayudaron a elegir mi bateria y, además, me ayudaron en la instalación
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 DC120-12A model AGM? What does this technology offer?
Yes. The DC120-12A 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 DC120-12A model?
Expected lifespan of the Fullriver DC120-12A 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 DC120-12A battery?
Dimensions (length × width × height) are 407×171×240 mm — also written as 407x171x240 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 DC120-12A 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 DC120-12A typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which interchangeable batteries are there for this one?
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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