# Fulmen FG1251 · Truck battery 12V 125Ah 760A

![Fulmen FG1251 · Truck battery 12V 125Ah 760A](https://bateriasonline.es/2770-home_default/fulmen-fg1251.jpg)

> Fulmen FG1251: 125 Ah truck battery, 760 A (EN), 349×175×285 mm, positive terminal on the left. Equivalent to Exide EG1251 and Exide EF1251.

**Category:** [Truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries) → [Fulmen](https://bateriasonline.es/en/fulmen-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fulmen-fg1251
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FG1251
- **EAN**: 3661024045414
- **MPN**: FG1251
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulmen |
| Range | FULMEN StartPRO |
| Application | Trucks and commercial vehicles |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 125 Ah |
| Cold cranking amps (EN) | 760 A |
| Length | 349 mm |
| Width | 175 mm |
| Height | 285 mm |
| Weight | 29.5 kg |
| Polarity | Positive terminal on the left |

## Quick description

Fulmen FG1251: truck battery with 12 V, 125 Ah and 760 A cold cranking current, measuring 349 × 175 × 285 mm, with the positive terminal on the left. If yours has the positive terminal on the right, you need the Fulmen FG1250.

## Description

## Where the Fulmen FG1251 fits

The Fulmen FG1251 is a starter battery for trucks, tractors and machinery: high capacity, robust terminals and a build that withstands vibration and the starts of large engines. It is built to resist constant vibration and long shifts.
The FG1251 belongs to the Fulmen FULMEN StartPRO range. [See all Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## Inside the FG1251: lead-acid technology

The FG1251 is a conventional lead-acid battery, with plates immersed in liquid electrolyte. In cars without energy management, the FG1251 needs no special registration: just connect it.

## Fulmen FG1251 vs FF1251, FG1250 and FG1101: which one to choose?

What sets the FG1251 apart from its neighbours in the Fulmen range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulmen FG1251 (this one) | 125 Ah | 760 A | 349 × 175 × 285 | left | 29.5 kg |
| Fulmen FF1251 | 125 Ah | 850 A | 349 × 175 × 285 | left | 31 kg |
| Fulmen FG1250 | 125 Ah | 760 A | 349 × 175 × 285 | right | 29.5 kg |
| Fulmen FG1101 | 110 Ah | 750 A | 349 × 175 × 235 | left | 25.4 kg |

- Fulmen FF1251: the same capacity, 90 A more cranking power, the same dimensions.
- If the positive terminal of your battery is on the other side, the one you need is the Fulmen FG1250 (positive terminal on the right).
- Fulmen FG1101: 15 Ah less, 10 A less cranking power, a different case (349 × 175 × 235 mm).

## Equivalents and alternatives to the Fulmen FG1251

Batteries that fit the FG1251's tray with the same polarity; besides other conventional batteries, an EFB or AGM of this size is a valid upgrade for the FG1251.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EG1251 | Lead-acid | 125 Ah | 760 A | 349 × 175 × 285 |
| Tudor TG1251 | Lead-acid | 125 Ah | 760 A | 349 × 175 × 285 |
| Deta DG1251 | Lead-acid | 125 Ah | 760 A | 349 × 175 × 285 |
| Varta J2 | Lead-acid | 125 Ah | 720 A | 349 × 175 × 285 |
| Exide EF1251 | Lead-acid | 125 Ah | 850 A | 349 × 175 × 285 |
| Tudor TF1251 | Lead-acid | 125 Ah | 850 A | 349 × 175 × 285 |

## Part numbers and codes for the Fulmen FG1251

Look for any of these FG1251 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | FG1251 |
|---|---|
| EAN | 3661024045414 |
| Not to be confused with | Fulmen FF1251 (125 Ah, 850 A), Fulmen FG1250 (125 Ah, 760 A, positive terminal on the right) |

## Check this before ordering the Fulmen FG1251

- Check the EN amps on your battery: if it says 760 A or less, the FG1251 covers your engine.
- Capacity of the FG1251: 125 Ah; the same as your current battery or slightly more is fine.
- The FG1251 has the positive terminal on the left: compare it with your current battery.
- Measure the space: the FG1251 takes up 349 × 175 × 285 mm.

## Frequently asked questions about the Fulmen FG1251

### FG1251 or FF1251: which one suits me?

Compared with the FG1251, the Fulmen FF1251 has 90 A more cranking power. If your current battery says 850 A or more, choose the FF1251; if it says 760 A or less, the FG1251 is enough. Both measure 349 × 175 × 285 mm, so they fit the same tray.

### Fulmen FG1251 or FG1250: what is the difference?

Only the polarity: the FG1251 has the positive terminal on the left and the FG1250 the positive terminal on the right. Capacity (125 Ah), cranking power and dimensions are identical.

### How much does the Fulmen FG1251 weigh?

29.5 kg, with 125 Ah of capacity. For reference, the Fulmen FF1251 (125 Ah) weighs 31 kg.

### Which battery is equivalent to the Fulmen FG1251?

With the same dimensions, polarity and similar capacity you have the Exide EG1251, Tudor TG1251 and Deta DG1251. As the FG1251 is a conventional battery, an EFB or AGM of the same size also works.

### What does HD or vibration resistance mean on a truck battery?

That the plates are fixed to withstand intense vibration (EN 50342 V3/V4). It is essential in construction, agriculture and long-haul transport.

## Keep comparing: alternatives to the FG1251

- [All truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries)
- [More Fulmen models](https://bateriasonline.es/en/fulmen-batteries)
- [Exide EG1251](https://bateriasonline.es/en/exide-eg1251) · 125 Ah, 760 A, 349×175×285 mm
- [Tudor TG1251](https://bateriasonline.es/en/tudor-tg1251) · 125 Ah, 760 A, 349×175×285 mm

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