# Fulmen FK111 · Auxiliary battery 12V 11Ah 150A

![Fulmen FK111 · Auxiliary battery 12V 11Ah 150A](https://bateriasonline.es/2681-home_default/fulmen-fk111.jpg)

> Fulmen FK111: 11 Ah auxiliary battery, 150 A (EN), 150×90×130 mm, positive terminal on the left, AGM. Equivalent to Exide EK111 and Tudor TK111.

**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-fk111
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FK111
- **EAN**: 3661024046343
- **MPN**: FK111
- **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 | 11 Ah |
| Cold cranking amps (EN) | 150 A |
| Length | 150 mm |
| Width | 90 mm |
| Height | 130 mm |
| Weight | 3.9 kg |
| Polarity | Positive terminal on the left |
| Terminal type | M04 |

## Quick description

The Fulmen FK111 is an auxiliary battery (AGM) with 12 V, 11 Ah and 150 A cold cranking current, measuring 150 × 90 × 130 mm, with the positive terminal on the left.

## Description

## Who the Fulmen FK111 is for

The Fulmen FK111 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The FK111 belongs to the Fulmen FULMEN Start-Stop Auxiliary range. [See all Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## AGM technology in the FK111

Inside, the FK111 has glass fibre separators (AGM) that hold the electrolyte. The FK111 needs a charger with an AGM mode that does not exceed 14.7 V.

## Fulmen FK111 vs FK131 and FK091: which one to choose?

How the FK111 compares with Fulmen batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulmen FK111 (this one) | 11 Ah | 150 A | 150 × 90 × 130 | left | 3.9 kg |
| Fulmen FK131 | 13 Ah | 200 A | 150 × 90 × 145 | left | 4.5 kg |
| Fulmen FK091 | 9 Ah | 120 A | 150 × 90 × 105 | left | 3.1 kg |

- Fulmen FK131: 2 Ah more, 50 A more cranking power, a different case (150 × 90 × 145 mm).
- Fulmen FK091: 2 Ah less, 30 A less cranking power, a different case (150 × 90 × 105 mm).

## Equivalents and alternatives to the Fulmen FK111

Other AGM batteries that fit the FK111's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EK111 | AGM | 11 Ah | 150 A | 150 × 90 × 130 |
| Tudor TK111 | AGM | 11 Ah | 150 A | 150 × 90 × 130 |
| Deta DK111 | AGM | 11 Ah | 150 A | 150 × 90 × 130 |
| Fulbat AUX12 | AGM | 10.5 Ah | – | 150 × 87 × 130 |

## Part numbers and codes for the Fulmen FK111

This is how the Fulmen FK111 appears on the label and in parts catalogues:

| Commercial reference | FK111 |
|---|---|
| EAN | 3661024046343 |
| Terminal type | M04 |
| Not to be confused with | Fulmen FK131 (13 Ah, 200 A), Fulmen FK151 (15 Ah, 200 A) |

## Check this before ordering the Fulmen FK111

- Check the EN amps on your battery: if it says 150 A or less, the FK111 covers your engine.
- With 11 Ah, the FK111 replaces an original battery of that capacity or slightly less.
- Polarity of the FK111: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Length, width and height of the FK111: 150 × 90 × 130 mm.

## Frequently asked questions about the Fulmen FK111

### FK111 or FK131: which one suits me?

Compared with the FK111, the Fulmen FK131 has 2 Ah more and 50 A more cranking power. If your current battery says 200 A or more, choose the FK131; if it says 150 A or less, the FK111 is enough. Mind the space: the FK131 measures 150 × 90 × 145 mm.

### How much does the Fulmen FK111 weigh?

3.9 kg, with 11 Ah of capacity. For reference, the Fulmen FK131 (13 Ah) weighs 4.5 kg.

### Which battery is equivalent to the Fulmen FK111?

Only other AGM batteries with its dimensions and polarity: Exide EK111, Tudor TK111 and Deta DK111. Neither an EFB nor a conventional battery replaces the FK111.

### Which side is the positive terminal on the Fulmen FK111?

On the FK111, 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.

## More batteries to compare with the FK111

- [More 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 EK111](https://bateriasonline.es/en/exide-ek111) · 11 Ah, 150 A, 150×90×130 mm
- [Tudor TK111](https://bateriasonline.es/en/tudor-tk111) · 11 Ah, 150 A, 150×90×130 mm

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