# Fullriver FT620-51 · Boat battery 12V 55Ah 620A

![Fullriver FT620-51 · Boat battery 12V 55Ah 620A](https://bateriasonline.es/2521-home_default/fullriver-ft620-51.jpg)

> Fullriver FT620-51: 55 Ah boat battery, 620 A (EN), 229×138×230 mm, AGM. Compare sizes and equivalents; 14-day returns.

**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-ft620-51
- **Language**: en
- **Brand**: Fullriver
- **Reference**: BOL-FULLRIVER-FT620-51
- **MPN**: FT620-51
- **Price**: 259,41 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fullriver |
| Range | Full Throttle Series |
| Application | Boats |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 55 Ah |
| Cold cranking amps (EN) | 620 A |
| Length | 229 mm |
| Width | 138 mm |
| Height | 230 mm |
| Weight | 18 kg |
| Terminal type | M8 + TP28 (SAE) |

## Quick description

The Fullriver FT620-51 is a boat battery with 12 V, 55 Ah and 620 A cold cranking current, measuring 229 × 138 × 230 mm.

## Description

## Who the Fullriver FT620-51 is for

The Fullriver FT620-51 is made for marine use. Fit the FT620-51 securely on board and away from bilge water.
The FT620-51 belongs to the Fullriver Full Throttle Series range. [See all Fullriver batteries](https://bateriasonline.es/en/fullriver-batteries)

## Equivalents and alternatives to the Fullriver FT620-51

No other reference in the catalogue fully matches the dimensions and polarity of the FT620-51; you will find the closest ones among our [marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries).

## Fullriver FT620-51 vs FFD55-12 and DC55-12

How the FT620-51 compares with Fullriver batteries of similar size and capacity:

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

- Fullriver FFD55-12: the same capacity, 270 A less cranking power, a different case (229 × 138 × 212 mm).
- Fullriver DC55-12: the same capacity, 220 A less cranking power, a different case (229 × 138 × 212 mm).

## What it means that the FT620-51 is AGM

Inside, the FT620-51 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Check this before ordering the Fullriver FT620-51

- Measure the space: the FT620-51 takes up 229 × 138 × 230 mm.
- Capacity of the FT620-51: 55 Ah; the same as your current battery or slightly more is fine.
- The FT620-51 delivers 620 A cold cranking (EN standard); do not go below what your original battery states.

## Fullriver FT620-51 codes and part numbers

Shops, garages and catalogues identify the FT620-51 with these codes:

| Commercial reference | FT620-51 |
|---|---|
| Terminal type | M8 + TP28 (SAE) |

## Frequently asked questions about the Fullriver FT620-51

### Fullriver FT620-51 or FFD55-12?

Compared with the FT620-51, the Fullriver FFD55-12 has 270 A less cranking power. The FT620-51 cranks harder; the FFD55-12 is only a good option if your original battery says 350 A or less. Mind the space: the FFD55-12 measures 229 × 138 × 212 mm.

### How much does the Fullriver FT620-51 weigh?

The FT620-51 weighs 18 kg. For reference, the Fullriver FFD55-12 (55 Ah) weighs 16.4 kg.

### Can the Fullriver FT620-51 be used for starting and service at the same time?

Only if it is dual purpose. A starter battery is not built for deep discharge, and a service battery does not deliver the current peak the engine asks for.

## More batteries to compare with the FT620-51

- [All marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries)
- [The whole Fullriver range](https://bateriasonline.es/en/fullriver-batteries)

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