# Fullriver FFD55-12 · Boat battery 12V 55Ah 350A

![Fullriver FFD55-12 · Boat battery 12V 55Ah 350A](https://bateriasonline.es/2245-home_default/fullriver-ffd55-12.jpg)

> Fullriver FFD55-12: 55 Ah boat battery, 350 A (EN), 229×138×212 mm, AGM. Equivalent to Fullriver DC55-12.

**Category:** [Marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries) → [Fullriver](https://bateriasonline.es/en/fullriver-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fullriver-ffd55-12
- **Language**: en
- **Brand**: Fullriver
- **Reference**: BOL-FULLRIVER-FFD55-12
- **MPN**: FFD55-12
- **Price**: 331,14 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fullriver |
| Range | FULLRIVER FF |
| Application | Boats |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 55 Ah |
| Cold cranking amps (EN) | 350 A |
| Length | 229 mm |
| Width | 138 mm |
| Height | 212 mm |
| Weight | 16.4 kg |
| Terminal type | M6 |

## Quick description

The Fullriver FFD55-12 is a boat battery with 12 V, 55 Ah and 350 A cold cranking current, measuring 229 × 138 × 212 mm.

## Description

## The Fullriver FFD55-12 at a glance

The Fullriver FFD55-12 is a battery for boats: engine starting or on-board service, depending on its design, with resistance to damp and hull vibration. Fit the FFD55-12 securely on board and away from bilge water.
The FFD55-12 belongs to the Fullriver FULLRIVER FF range. [See all Fullriver batteries](https://bateriasonline.es/en/fullriver-batteries)

## Inside the FFD55-12: AGM technology

The FFD55-12 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. It withstands many more cycles than a conventional lead battery, at the cost of being more sensitive to overcharging.

## Fullriver FFD55-12 vs DC55-12 and FT620-51: which one to choose?

Torn between the FFD55-12 and another similar Fullriver? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Fullriver FFD55-12 (this one) | 55 Ah | 350 A | 229 × 138 × 212 | 16.4 kg |
| Fullriver DC55-12 | 55 Ah | 400 A | 229 × 138 × 212 | 17.6 kg |
| Fullriver FT620-51 | 55 Ah | 620 A | 229 × 138 × 230 | 18 kg |

- Fullriver DC55-12: the same capacity, 50 A more cranking power, the same dimensions.
- Fullriver FT620-51: the same capacity, 270 A more cranking power, a different case (229 × 138 × 230 mm).

## Equivalents and alternatives to the Fullriver FFD55-12

Other AGM batteries that fit the FFD55-12's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Fullriver DC55-12 | AGM | 55 Ah | 400 A | 229 × 138 × 212 |

## Part numbers and codes for the Fullriver FFD55-12

The FFD55-12 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | FFD55-12 |
|---|---|
| Terminal type | M6 |
| Not to be confused with | Fullriver FFD35-12 (35 Ah, 225 A) |

## Check this before ordering the Fullriver FFD55-12

- Check the EN amps on your battery: if it says 350 A or less, the FFD55-12 covers your engine.
- Your current battery should say about 55 Ah; a little more is also fine.
- The FFD55-12 needs 229 × 138 × 212 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Fullriver FFD55-12

### FFD55-12 or DC55-12: which one suits me?

Compared with the FFD55-12, the Fullriver DC55-12 has 50 A more cranking power. If your current battery says 400 A or more, choose the DC55-12; if it says 350 A or less, the FFD55-12 is enough. Both measure 229 × 138 × 212 mm, so they fit the same tray.

### How much does the Fullriver FFD55-12 weigh?

16.4 kg, with 55 Ah of capacity. For reference, the Fullriver DC55-12 (55 Ah) weighs 17.6 kg.

### Which battery is equivalent to the Fullriver FFD55-12?

Only other AGM batteries with its dimensions and polarity: Fullriver DC55-12. Neither an EFB nor a conventional battery replaces the FFD55-12.

### Which charger does the Fullriver FFD55-12 need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## More batteries to compare with the FFD55-12

- [More marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries)
- [Full Fullriver catalogue](https://bateriasonline.es/en/fullriver-batteries)
- [Fullriver DC55-12](https://bateriasonline.es/en/fullriver-dc55-12) · 55 Ah, 400 A, 229×138×212 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-10*