# Fulmen FK720 · Start-Stop battery 12V 72Ah 760A

![Fulmen FK720 · Start-Stop battery 12V 72Ah 760A](https://bateriasonline.es/2654-home_default/fulmen-fk720.jpg)

> Fulmen FK720: 72 Ah Start-Stop battery, 760 A (EN), 278×175×190 mm, positive terminal on the right, L3 case, AGM. Equivalent to Exide EK720 and Tudor TK720.

**Category:** [Start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb) → [Fulmen](https://bateriasonline.es/en/fulmen-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fulmen-fk720
- **Language**: en
- **Brand**: Fulmen
- **Reference**: BOL-FULMEN-FK720
- **EAN**: 3661024047401
- **MPN**: FK720
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulmen |
| Range | FULMEN AGM |
| Application | Start-Stop cars |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 72 Ah |
| Cold cranking amps (EN) | 760 A |
| Length | 278 mm |
| Width | 175 mm |
| Height | 190 mm |
| Weight | 20.6 kg |
| Polarity | Positive terminal on the right |
| Case size | L3 (278 × 175 × 190 mm) |

## Quick description

Fulmen FK720: Start-Stop battery (AGM) with 12 V, 72 Ah and 760 A cold cranking current, case size L3 (278 × 175 × 190 mm), with the positive terminal on the right.

## Description

## Where the Fulmen FK720 fits

The Fulmen FK720 is a battery for cars with Start-Stop: it withstands many more starting and partial-discharge cycles than a conventional battery and powers the electronics every time the engine stops at the lights. It takes repeated discharges without losing capacity the way a conventional battery would.
At 72 Ah it sits in the range of compact and mid-size diesels, SUVs and MPVs. The FK720 belongs to the Fulmen FULMEN AGM range. [See all Fulmen batteries](https://bateriasonline.es/en/fulmen-batteries)

## Fulmen FK720 vs FK700 and FK800: differences

The real differences between the FK720 and the closest Fulmen models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulmen FK720 (this one) | 72 Ah | 760 A | 278 × 175 × 190 | right | 20.6 kg |
| Fulmen FK700 | 70 Ah | 760 A | 278 × 175 × 190 | right | 20.6 kg |
| Fulmen FK800 | 80 Ah | 800 A | 315 × 175 × 190 | right | 23.1 kg |

- Fulmen FK700: 2 Ah less, the same cranking power, the same L3 case.
- Fulmen FK800: 8 Ah more, 40 A more cranking power, a different case (315 × 175 × 190 mm).

## Fulmen FK720 codes and part numbers

Look for any of these FK720 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | FK720 |
|---|---|
| EAN | 3661024047401 |
| Case size (EN) | L3 |
| Not to be confused with | Fulmen FK620 (62 Ah, 680 A), Fulmen FK700 (70 Ah, 760 A), Fulmen FK820 (82 Ah, 800 A) |

## Equivalents and alternatives to the Fulmen FK720

As the FK720 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 EK720 | AGM | 72 Ah | 760 A | 278 × 175 × 190 |
| Tudor TK720 | AGM | 72 Ah | 760 A | 278 × 175 × 190 |
| Deta DK720 | AGM | 72 Ah | 760 A | 278 × 175 × 190 |
| Varta A7 | AGM | 70 Ah | 760 A | 278 × 175 × 190 |
| Deta DK700 | AGM | 70 Ah | 760 A | 278 × 175 × 190 |
| Fulmen FK700 | AGM | 70 Ah | 760 A | 278 × 175 × 190 |

Its Bosch equivalent is the Bosch S5 A08, the same as for the Varta A7. Bosch is not part of our catalogue; we list it so you can compare.

## What to look at before buying the FK720

- The FK720 needs 278 × 175 × 190 mm of space (European case size L3): measure it with the hold-down clamp in place.
- Polarity of the FK720: positive terminal on the right (if yours has it on the other side, the cables will not reach).
- Capacity of the FK720: 72 Ah; the same as your current battery or slightly more is fine.
- Check the EN amps on your battery: if it says 760 A or less, the FK720 covers your engine.
- The FK720 is AGM: it replaces an AGM or an EFB of the same size. You can swap an EFB for an AGM, but not an AGM for an EFB.

## Inside the FK720: AGM technology

The FK720 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the FK720 can be fitted in the boot or under a seat with no risk of spills.

## Frequently asked questions about the Fulmen FK720

### Fulmen FK720 or FK700?

Compared with the FK720, the Fulmen FK700 has 2 Ah less. With the same cranking power (760 A), the FK720 and the FK700 differ in capacity: the one with more Ah supports more load with the engine off. Both measure 278 × 175 × 190 mm, so they fit the same tray.

### Can the Fulmen FK720 be used in a car with Start-Stop?

Yes. As an AGM battery, the FK720 handles automatic engine stop and brake energy recovery, and it can replace an EFB of the same size.

### How much does the Fulmen FK720 weigh?

The FK720 weighs 20.6 kg. For reference, the Fulmen FK700 (70 Ah) weighs 20.6 kg.

### Which battery is equivalent to the Fulmen FK720?

Only other AGM batteries with its dimensions and polarity: Exide EK720, Tudor TK720 and Deta DK720. Neither an EFB nor a conventional battery replaces the FK720. Its Bosch equivalent is the Bosch S5 A08, the same as for the Varta A7. Bosch is not part of our catalogue; we list it so you can compare.

### What case size is the Fulmen FK720?

Case size L3: 278 × 175 × 190 mm. The FK720 fits any standard L3 battery tray such as the Exide EK720.

### Which side is the positive terminal on the Fulmen FK720?

The FK720 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

## Other options if you are unsure about the FK720

- [All start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb)
- [More Fulmen models](https://bateriasonline.es/en/fulmen-batteries)
- [Exide EK720](https://bateriasonline.es/en/exide-ek720) · 72 Ah, 760 A, 278×175×190 mm
- [Tudor TK720](https://bateriasonline.es/en/tudor-tk720) · 72 Ah, 760 A, 278×175×190 mm

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