# Fulbat FDM12-800-M27 · Dual-purpose marine battery 12V 92Ah 800A

![Fulbat FDM12-800-M27 · Dual-purpose marine battery 12V 92Ah 800A](https://bateriasonline.es/449-home_default/fulbat-fdm12-800-m27.jpg)

> Fulbat FDM12-800-M27: 92 Ah dual-purpose marine battery, 800 A (EN), 306×168×233 mm, positive terminal on the left, carbon AGM. Ask for a no-obligation quote.

**Category:** [Dual-purpose marine batteries (starting and service)](https://bateriasonline.es/en/dual-purpose-marine-batteries) → [Fulbat](https://bateriasonline.es/en/fulbat-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fulbat-fdm12-800-m27
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FDM12-800-M27
- **MPN**: FDM12-800-M27
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT FDM Marine AGM Carbon |
| Application | Boats (starting and service) |
| Technology | Carbon AGM |
| Voltage | 12 V |
| Capacity | 92 Ah |
| Cold cranking amps (EN) | 800 A |
| Length | 306 mm |
| Width | 168 mm |
| Height | 233 mm |
| Weight | 28.5 kg |
| Polarity | Positive terminal on the left |
| Terminal type | DUAL |

## Quick description

Fulbat FDM12-800-M27: dual-purpose marine battery with 12 V, 92 Ah and 800 A cold cranking current, measuring 306 × 168 × 233 mm, with the positive terminal on the left.

## Description

## Where the Fulbat FDM12-800-M27 fits

The Fulbat FDM12-800-M27 is a dual-purpose marine battery: it starts the engine and, at the same time, powers lights, bilge pump and electronics while the boat is at anchor.
The FDM12-800-M27 belongs to the Fulbat FULBAT FDM Marine AGM Carbon range. [More Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat FDM12-800-M27

We have no other battery with exactly the dimensions and polarity of the FDM12-800-M27. Browse the rest of our [dual-purpose marine batteries (starting and service)](https://bateriasonline.es/en/dual-purpose-marine-batteries) to compare close options.

## Fulbat FDM12-800-M27 vs FDM12-825-M31 and FDM12-550-M24: differences

What sets the FDM12-800-M27 apart from its neighbours in the Fulbat range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat FDM12-800-M27 (this one) | 92 Ah | 800 A | 306 × 168 × 233 | left | 28.5 kg |
| Fulbat FDM12-825-M31 | 105 Ah | 825 A | 330 × 173 × 237 | left | 30.6 kg |
| Fulbat FDM12-550-M24 | 79 Ah | 550 A | 260 × 168 × 233 | left | 23 kg |

- Fulbat FDM12-825-M31: 13 Ah more, 25 A more cranking power, a different case (330 × 173 × 237 mm).
- Fulbat FDM12-550-M24: 13 Ah less, 250 A less cranking power, a different case (260 × 168 × 233 mm).

## Inside the FDM12-800-M27: carbon AGM technology

The FDM12-800-M27 is an AGM battery with carbon added to the negative plates. It works well even when the charge is not completed every day, which is common in solar installations.

## Check this before ordering the Fulbat FDM12-800-M27

- Length, width and height of the FDM12-800-M27: 306 × 168 × 233 mm.
- Polarity of the FDM12-800-M27: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Your current battery should say about 92 Ah; a little more is also fine.
- Check the EN amps on your battery: if it says 800 A or less, the FDM12-800-M27 covers your engine.

## Part numbers and codes for the Fulbat FDM12-800-M27

The FDM12-800-M27 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | FDM12-800-M27 |
|---|---|
| Terminal type | DUAL |

## Frequently asked questions about the Fulbat FDM12-800-M27

### FDM12-800-M27 or FDM12-825-M31: which one suits me?

Compared with the FDM12-800-M27, the Fulbat FDM12-825-M31 has 13 Ah more and 25 A more cranking power. If your current battery says 825 A or more, choose the FDM12-825-M31; if it says 800 A or less, the FDM12-800-M27 is enough. Mind the space: the FDM12-825-M31 measures 330 × 173 × 237 mm.

### How much does the Fulbat FDM12-800-M27 weigh?

28.5 kg, with 92 Ah of capacity. For reference, the Fulbat FDM12-825-M31 (105 Ah) weighs 30.6 kg.

### Which side is the positive terminal on the Fulbat FDM12-800-M27?

On the FDM12-800-M27, the positive terminal is on the left with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### How far can I discharge a dual-purpose battery?

Better not to go below 50%. If you drain the battery on every trip, consider a separate service bank with deep-cycle batteries.

## More batteries to compare with the FDM12-800-M27

- [Other dual-purpose marine batteries (starting and service)](https://bateriasonline.es/en/dual-purpose-marine-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)

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