# Fulmen FK143 · Auxiliary battery 12V 14Ah 80A

![Fulmen FK143 · Auxiliary battery 12V 14Ah 80A](https://bateriasonline.es/2806-home_default/fulmen-fk143.jpg)

> Fulmen FK143: 14 Ah auxiliary battery, 80 A (EN), 150×100×100 mm, AGM. Equivalent to Exide EK143 and Tudor TK143. Ask for a no-obligation quote.

**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-fk143
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FK143
- **EAN**: 3661024046466
- **MPN**: FK143
- **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 | 14 Ah |
| Cold cranking amps (EN) | 80 A |
| Length | 150 mm |
| Width | 100 mm |
| Height | 100 mm |
| Weight | 4.2 kg |
| Terminal layout | 3 |
| Terminal type | Screwed/Lug |

## Quick description

Fulmen FK143: auxiliary battery (AGM) with 12 V, 14 Ah and 80 A cold cranking current, measuring 150 × 100 × 100 mm.

## Description

## Where the Fulmen FK143 fits

The Fulmen FK143 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The FK143 belongs to the Fulmen FULMEN Start-Stop Auxiliary range. [The full range of Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## Equivalents and alternatives to the Fulmen FK143

As the FK143 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 EK143 | AGM | 14 Ah | 80 A | 150 × 100 × 100 |
| Tudor TK143 | AGM | 14 Ah | 80 A | 150 × 100 × 100 |
| Deta DK143 | AGM | 14 Ah | 80 A | 150 × 100 × 100 |

## Fulmen FK143 vs FK111 and FK131: differences

The real differences between the FK143 and the closest Fulmen models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Fulmen FK143 (this one) | 14 Ah | 80 A | 150 × 100 × 100 | 4.2 kg |
| Fulmen FK111 | 11 Ah | 150 A | 150 × 90 × 130 | 3.9 kg |
| Fulmen FK131 | 13 Ah | 200 A | 150 × 90 × 145 | 4.5 kg |

- Fulmen FK111: 3 Ah less, 70 A more cranking power, a different case (150 × 90 × 130 mm).
- Fulmen FK131: 1 Ah less, 120 A more cranking power, a different case (150 × 90 × 145 mm).

## AGM technology in the FK143

Inside, the FK143 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Before ordering the FK143, check this

- The FK143 needs 150 × 100 × 100 mm of space: measure it with the hold-down clamp in place.
- Capacity of the FK143: 14 Ah; the same as your current battery or slightly more is fine.
- The FK143 delivers 80 A cold cranking (EN standard); do not go below what your original battery states.

## Fulmen FK143 codes and part numbers

Shops, garages and catalogues identify the FK143 with these codes:

| Commercial reference | FK143 |
|---|---|
| EAN | 3661024046466 |
| Terminal type | Screwed/Lug |

## Frequently asked questions about the Fulmen FK143

### Fulmen FK143 or FK111?

Compared with the FK143, the Fulmen FK111 has 3 Ah less and 70 A more cranking power. If your current battery says 150 A or more, choose the FK111; if it says 80 A or less, the FK143 is enough. Mind the space: the FK111 measures 150 × 90 × 130 mm.

### How much does the Fulmen FK143 weigh?

The FK143 weighs 4.2 kg. For reference, the Fulmen FK111 (11 Ah) weighs 3.9 kg.

### Which battery is equivalent to the Fulmen FK143?

Only other AGM batteries with its dimensions and polarity: Exide EK143, Tudor TK143 and Deta DK143. Neither an EFB nor a conventional battery replaces the FK143.

### Which charger does the Fulmen FK143 need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## More batteries to compare with the FK143

- [Other 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 EK143](https://bateriasonline.es/en/exide-ek143) · 14 Ah, 80 A, 150×100×100 mm
- [Tudor TK143](https://bateriasonline.es/en/tudor-tk143) · 14 Ah, 80 A, 150×100×100 mm

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