# Fulmen FK151 · Auxiliary battery 12V 15Ah 200A

![Fulmen FK151 · Auxiliary battery 12V 15Ah 200A](https://bateriasonline.es/2687-home_default/fulmen-fk151.jpg)

> Fulmen FK151: 15 Ah auxiliary battery, 200 A (EN), 150×90×145 mm, positive terminal on the left, AGM. Equivalent to Exide EK151 and Exide EK131.

**Category:** [Auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries) → [Fulmen](https://bateriasonline.es/en/fulmen-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fulmen-fk151
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FK151
- **EAN**: 3661024046350
- **MPN**: FK151
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulmen |
| Range | FULMEN Start-Stop Auxiliary |
| Application | Auxiliary and back-up use |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 15 Ah |
| Cold cranking amps (EN) | 200 A |
| Length | 150 mm |
| Width | 90 mm |
| Height | 145 mm |
| Weight | 4.8 kg |
| Polarity | Positive terminal on the left |
| Terminal type | Bornes fines |

## Quick description

Fulmen FK151: auxiliary battery (AGM) with 12 V, 15 Ah and 200 A cold cranking current, measuring 150 × 90 × 145 mm, with the positive terminal on the left.

## Description

## Where the Fulmen FK151 fits

The Fulmen FK151 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The FK151 belongs to the Fulmen FULMEN Start-Stop Auxiliary range. [See all Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## AGM technology in the FK151

Inside, the FK151 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Fulmen FK151 vs FK131 and FK111: which one to choose?

The real differences between the FK151 and the closest Fulmen models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulmen FK151 (this one) | 15 Ah | 200 A | 150 × 90 × 145 | left | 4.8 kg |
| Fulmen FK131 | 13 Ah | 200 A | 150 × 90 × 145 | left | 4.5 kg |
| Fulmen FK111 | 11 Ah | 150 A | 150 × 90 × 130 | left | 3.9 kg |

- Fulmen FK131: 2 Ah less, the same cranking power, the same dimensions.
- Fulmen FK111: 4 Ah less, 50 A less cranking power, a different case (150 × 90 × 130 mm).

## Equivalents and alternatives to the Fulmen FK151

As the FK151 is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EK151 | AGM | 15 Ah | 200 A | 150 × 90 × 145 |
| Tudor TK151 | AGM | 15 Ah | 200 A | 150 × 90 × 145 |
| Deta DK151 | AGM | 15 Ah | 200 A | 150 × 90 × 145 |
| Exide EK131 | AGM | 13 Ah | 200 A | 150 × 90 × 145 |
| Tudor TK131 | AGM | 13 Ah | 200 A | 150 × 90 × 145 |
| Deta DK131 | AGM | 13 Ah | 200 A | 150 × 90 × 145 |

## Fulmen FK151 codes and part numbers

Shops, garages and catalogues identify the FK151 with these codes:

| Commercial reference | FK151 |
|---|---|
| EAN | 3661024046350 |
| Terminal type | Bornes fines |
| Not to be confused with | Fulmen FK111 (11 Ah, 150 A), Fulmen FK131 (13 Ah, 200 A) |

## Before ordering the FK151, check this

- Check the EN amps on your battery: if it says 200 A or less, the FK151 covers your engine.
- Capacity of the FK151: 15 Ah; the same as your current battery or slightly more is fine.
- Polarity of the FK151: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Length, width and height of the FK151: 150 × 90 × 145 mm.

## Frequently asked questions about the Fulmen FK151

### Fulmen FK151 or FK131?

Compared with the FK151, the Fulmen FK131 has 2 Ah less. With the same cranking power (200 A), the FK151 and the FK131 differ in capacity: the one with more Ah supports more load with the engine off. Both measure 150 × 90 × 145 mm, so they fit the same tray.

### How much does the Fulmen FK151 weigh?

The FK151 weighs 4.8 kg. For reference, the Fulmen FK131 (13 Ah) weighs 4.5 kg.

### Which battery is equivalent to the Fulmen FK151?

Only other AGM batteries with its dimensions and polarity: Exide EK151, Tudor TK151 and Deta DK151. Neither an EFB nor a conventional battery replaces the FK151.

### Which side is the positive terminal on the Fulmen FK151?

The FK151 has the positive terminal on the left, looking at the battery from its long side with the terminals closest to you.

## Other options if you are unsure about the FK151

- [All auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [The whole Fulmen range](https://bateriasonline.es/en/fulmen-batteries)
- [Exide EK151](https://bateriasonline.es/en/exide-ek151) · 15 Ah, 200 A, 150×90×145 mm
- [Tudor TK151](https://bateriasonline.es/en/tudor-tk151) · 15 Ah, 200 A, 150×90×145 mm

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