# Marine battery Fullriver FT840-24M 12V 75Ah 840A AGM

![Marine battery Fullriver FT840-24M 12V 75Ah 840A AGM](https://baterias.com/3181-home_default/battery-fullriver-ft840-24m-12v-75ah-840a.jpg)

> Fullriver FT840-24M marine battery 12V 75Ah 840A AGM. Full Throttle Series range. Dimensions 276×172×227 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-fullriver-ft840-24m-12v-75ah-840a
- **Language**: en-GB
- **Brand**: FULLRIVER
- **Reference**: BCOM-FULLRIVER-FT840-24M
- **MPN**: FT840-24M
- **Price**: 607,70 €
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | FULLRIVER |
| Reference | FT840-24 M |
| Model | Full Throttle Series |
| Voltage (V) | 12 V |
| Largo | 276 cm |
| Ancho | 172 cm |
| Alto | 227 cm |
| Peso | 24.5 kg |
| Tecnología | AGM |
| EAN | 810233030688 |
| Terminal type | DT |
| Cold cranking amps (EN) | 840 |
| Capacity (C20) | 75 |
| Case type | 24 M |

## Quick description

**Fullriver FT840-24M 12V 75Ah 840A** 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
75 Ah C20

🔋 Cold cranking
840 A EN-1

📏 Dimensions
276×172×227 mm

⚙️ Technology
AGM

⚖️ Weight
24,5 kg

🏷️ Model
Full Throttle Series

## Description

## Marine battery Fullriver FT840-24M Full Throttle Series 75Ah 840A 12V

12*V* Voltage
75*Ah* Capacity
840*A* Cold cranking
24.50*kg* Weight

With **75 Ah** at **12 V** and **840 A** of cold cranking current (EN), the **Fullriver FT840-24M** from the **Full Throttle Series** range is built for motor and sailing boats, both for engine starting and onboard services. Measuring 276 × 172 × 227 mm, it is the direct replacement for boats fitted from the factory with a 75 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.

### Dimensions, polarity and mounting

It has external dimensions of 276 × 172 × 227 mm and weighs 24.50 kg. It uses DT terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.

### What the Fullriver FT840-24M is for

On board, the Fullriver FT840-24M provides 75 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 24.50 kg and DT terminals.

### The Fullriver FT840-24M: Full Throttle Series range and AGM technology

The **Full Throttle Series** is the Fullriver range the FT840-24M 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.

### What Fullriver does differently

Fullriver specialises in deep-cycle AGM batteries for mobility, marine, solar and traction. Its DC and HC series are known for their tolerance to deep discharge and long cycle life. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.

### Official warranty

The Fullriver FT840-24M 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

Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections.

### When you get it and how to return it

Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.

## Frequently asked questions

### Is this battery AGM? What is it for?

Yes. The FT840-24M 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 FT840-24M 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 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 FT840-24M model?

Expected lifespan of the Fullriver FT840-24M 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 FT840-24M battery?

Dimensions (length × width × height) are 276×172×227 mm — also written as 276x172x227 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 FT840-24M 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 FT840-24M typically fits a wide range of European vehicles thanks to its standard DIN case format.

### Which batteries are equivalent to the Fullriver FT840-24M?

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*