# Fulmen FG1203 · Truck battery 12V 120Ah 680A

![Fulmen FG1203 · Truck battery 12V 120Ah 680A](https://bateriasonline.es/2760-home_default/fulmen-fg1203.jpg)

> Fulmen FG1203: 120 Ah truck battery, 680 A (EN), 513×189×223 mm. Equivalent to Exide EG1203 and Tudor TG1203. Ask for a no-obligation quote.

**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-fg1203
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FG1203
- **EAN**: 3661024046541
- **MPN**: FG1203
- **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 | 120 Ah |
| Cold cranking amps (EN) | 680 A |
| Length | 513 mm |
| Width | 189 mm |
| Height | 223 mm |
| Weight | 32.5 kg |
| Terminal layout | 3 |

## Quick description

The Fulmen FG1203 is a truck battery with 12 V, 120 Ah and 680 A cold cranking current, measuring 513 × 189 × 223 mm.

## Description

## Who the Fulmen FG1203 is for

The Fulmen FG1203 turns heavy diesel engines and powers cabs with high consumption. With 120 Ah, the FG1203 suits heavy vehicles that had a battery of that capacity.
The FG1203 belongs to the Fulmen FULMEN StartPRO range. [More Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## Equivalents and alternatives to the Fulmen FG1203

Batteries that fit the FG1203's tray with the same polarity; besides other conventional batteries, an EFB or AGM of this size is a valid upgrade for the FG1203.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EG1203 | Lead-acid | 120 Ah | 680 A | 513 × 189 × 223 |
| Varta I8 | Lead-acid | 120 Ah | 680 A | 513 × 189 × 223 |
| Tudor TG1203 | Lead-acid | 120 Ah | 680 A | 513 × 189 × 223 |
| Deta DG1203 | Lead-acid | 120 Ah | 680 A | 513 × 189 × 223 |

## Fulmen FG1203 vs FG1403 and FF1453: which one to choose?

How the FG1203 compares with Fulmen batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Fulmen FG1203 (this one) | 120 Ah | 680 A | 513 × 189 × 223 | 32.5 kg |
| Fulmen FG1403 | 140 Ah | 800 A | 513 × 189 × 223 | 34.1 kg |
| Fulmen FF1453 | 145 Ah | 900 A | 513 × 189 × 223 | 35.9 kg |

- Fulmen FG1403: 20 Ah more, 120 A more cranking power, the same dimensions.
- Fulmen FF1453: 25 Ah more, 220 A more cranking power, the same dimensions.

## Inside the FG1203: lead-acid technology

Inside, the FG1203 is classic lead-acid: liquid electrolyte and lead plates. If the FG1203 is left discharged for weeks it sulphates: a maintenance charger prevents this.

## Before ordering the FG1203, check this

- The FG1203 needs 513 × 189 × 223 mm of space: measure it with the hold-down clamp in place.
- With 120 Ah, the FG1203 replaces an original battery of that capacity or slightly less.
- The FG1203 delivers 680 A cold cranking (EN standard); do not go below what your original battery states.

## Part numbers and codes for the Fulmen FG1203

This is how the Fulmen FG1203 appears on the label and in parts catalogues:

| Commercial reference | FG1203 |
|---|---|
| EAN | 3661024046541 |
| Not to be confused with | Fulmen FG1206 (120 Ah, 680 A), Fulmen FG1403 (140 Ah, 800 A), Fulmen FG1803 (180 Ah, 1,000 A) |

## Frequently asked questions about the Fulmen FG1203

### FG1203 or FG1403: which one suits me?

Compared with the FG1203, the Fulmen FG1403 has 20 Ah more and 120 A more cranking power. If your current battery says 800 A or more, choose the FG1403; if it says 680 A or less, the FG1203 is enough. Both measure 513 × 189 × 223 mm, so they fit the same tray.

### How much does the Fulmen FG1203 weigh?

32.5 kg, with 120 Ah of capacity. For reference, the Fulmen FG1403 (140 Ah) weighs 34.1 kg.

### Which battery is equivalent to the Fulmen FG1203?

With the same dimensions, polarity and similar capacity you have the Exide EG1203, Varta I8 and Tudor TG1203. As the FG1203 is a conventional battery, an EFB or AGM of the same size also works.

### Are truck batteries fitted in pairs?

Almost always, in series for 24 V. Replace them in matched pairs: mixing a new one with an old one unbalances charging and shortens the new one's life.

## More batteries to compare with the FG1203

- [All truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries)
- [The whole Fulmen range](https://bateriasonline.es/en/fulmen-batteries)
- [Exide EG1203](https://bateriasonline.es/en/exide-eg1203) · 120 Ah, 680 A, 513×189×223 mm
- [Varta I8](https://bateriasonline.es/en/varta-i8) · 120 Ah, 680 A, 513×189×223 mm

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