# Deta DK091 · Auxiliary battery 12V 9Ah 120A

![Deta DK091 · Auxiliary battery 12V 9Ah 120A](https://bateriasonline.es/2849-home_default/deta-dk091.jpg)

> Deta DK091: 9 Ah auxiliary battery, 120 A (EN), 150×90×105 mm, positive terminal on the left, AGM. Equivalent to Exide EK091 and Tudor TK091.

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

- **Canonical URL**: https://bateriasonline.es/en/deta-dk091
- **Language**: en
- **Brand**: Deta
- **Reference**: BOL-DETA-DK091
- **EAN**: 3661024026338
- **MPN**: DK091
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Deta |
| Range | DETA Start-Stop Auxiliary |
| Application | Auxiliary and back-up use |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 9 Ah |
| Cold cranking amps (EN) | 120 A |
| Length | 150 mm |
| Width | 90 mm |
| Height | 105 mm |
| Weight | 3.1 kg |
| Polarity | Positive terminal on the left |
| Terminal type | M12 |

## Quick description

The Deta DK091 is an auxiliary battery (AGM) with 12 V, 9 Ah and 120 A cold cranking current, measuring 150 × 90 × 105 mm, with the positive terminal on the left.

## Description

## The Deta DK091 at a glance

The Deta DK091 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The DK091 belongs to the Deta DETA Start-Stop Auxiliary range. [The full range of Deta batteries](https://bateriasonline.es/en/deta-batteries)

## What it means that the DK091 is AGM

Inside, the DK091 has glass fibre separators (AGM) that hold the electrolyte. The DK091 needs a charger with an AGM mode that does not exceed 14.7 V.

## Deta DK091 vs DK111: differences

Torn between the DK091 and another similar Deta? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Deta DK091 (this one) | 9 Ah | 120 A | 150 × 90 × 105 | left | 3.1 kg |
| Deta DK111 | 11 Ah | 150 A | 150 × 90 × 130 | left | 3.9 kg |

- Deta DK111: 2 Ah more, 30 A more cranking power, a different case (150 × 90 × 130 mm).

## Equivalents and alternatives to the Deta DK091

As the DK091 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 EK091 | AGM | 9 Ah | 120 A | 150 × 90 × 105 |
| Tudor TK091 | AGM | 9 Ah | 120 A | 150 × 90 × 105 |
| Fulmen FK091 | AGM | 9 Ah | 120 A | 150 × 90 × 105 |
| Varta AUX9 | AGM | 9 Ah | 130 A | 151 × 87 × 106 |
| Kronobat AUX9 | AGM | 9 Ah | 130 A | 151 × 87 × 106 |
| Fulbat AUX9 | AGM | 8.4 Ah | – | 150 × 87 × 105 |

## Deta DK091 codes and part numbers

This is how the Deta DK091 appears on the label and in parts catalogues:

| Commercial reference | DK091 |
|---|---|
| EAN | 3661024026338 |
| Terminal type | M12 |

## What to look at before buying the DK091

- The DK091 delivers 120 A cold cranking (EN standard); do not go below what your original battery states.
- With 9 Ah, the DK091 replaces an original battery of that capacity or slightly less.
- The DK091 has the positive terminal on the left: compare it with your current battery.
- Measure the space: the DK091 takes up 150 × 90 × 105 mm.

## Frequently asked questions about the Deta DK091

### Deta DK091 or DK111?

Compared with the DK091, the Deta DK111 has 2 Ah more and 30 A more cranking power. If your current battery says 150 A or more, choose the DK111; if it says 120 A or less, the DK091 is enough. Mind the space: the DK111 measures 150 × 90 × 130 mm.

### How much does the Deta DK091 weigh?

The DK091 weighs 3.1 kg. For reference, the Deta DK111 (11 Ah) weighs 3.9 kg.

### Which battery is equivalent to the Deta DK091?

Only other AGM batteries with its dimensions and polarity: Exide EK091, Tudor TK091 and Fulmen FK091. Neither an EFB nor a conventional battery replaces the DK091.

### Which side is the positive terminal on the Deta DK091?

The DK091 has the positive terminal on the left, looking at the battery from its long side with the terminals closest to you.

## Keep comparing: alternatives to the DK091

- [All auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [More Deta models](https://bateriasonline.es/en/deta-batteries)
- [Exide EK091](https://bateriasonline.es/en/exide-ek091) · 9 Ah, 120 A, 150×90×105 mm
- [Tudor TK091](https://bateriasonline.es/en/tudor-tk091) · 9 Ah, 120 A, 150×90×105 mm

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