# Kronobat AUX9 · Auxiliary battery 12V 9Ah 130A

![Kronobat AUX9 · Auxiliary battery 12V 9Ah 130A](https://bateriasonline.es/2080-home_default/kronobat-aux9.jpg)

> Kronobat AUX9: 9 Ah auxiliary battery, 130 A (EN), 151×87×106 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) → [Kronobat](https://bateriasonline.es/en/kronobat-batteries)

- **Canonical URL**: https://bateriasonline.es/en/kronobat-aux9
- **Language**: en
- **Brand**: Kronobat
- **Reference**: BOL-KRONOBAT-AUX9
- **MPN**: AUX9
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Kronobat |
| Range | AUXILIARY |
| Application | Auxiliary and back-up use |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 9 Ah |
| Cold cranking amps (EN) | 130 A |
| Length | 151 mm |
| Width | 87 mm |
| Height | 106 mm |
| Weight | 2.87 kg |
| Polarity | Positive terminal on the left |
| Terminal type | Y4 |

## Quick description

The Kronobat AUX9 is an auxiliary battery (AGM) with 12 V, 9 Ah and 130 A cold cranking current, measuring 151 × 87 × 106 mm, with the positive terminal on the left.

## Description

## Who the Kronobat AUX9 is for

The Kronobat AUX9 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The AUX9 belongs to the Kronobat AUXILIARY range. [See all Kronobat batteries](https://bateriasonline.es/en/kronobat-batteries)

## AGM technology in the AUX9

Inside, the AUX9 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Equivalents and alternatives to the Kronobat AUX9

Other AGM batteries that fit the AUX9's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Varta AUX9 | AGM | 9 Ah | 130 A | 151 × 87 × 106 |
| 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 |
| Deta DK091 | AGM | 9 Ah | 120 A | 150 × 90 × 105 |
| Fulbat AUX9 | AGM | 8.4 Ah | – | 150 × 87 × 105 |

## Part numbers and codes for the Kronobat AUX9

Shops, garages and catalogues identify the AUX9 with these codes:

| Commercial reference | AUX9 |
|---|---|
| Terminal type | Y4 |
| Not to be confused with | Kronobat AUX1 (35 Ah, 520 A, positive terminal on the right) |

## Before ordering the AUX9, check this

- The AUX9 delivers 130 A cold cranking (EN standard); do not go below what your original battery states.
- With 9 Ah, the AUX9 replaces an original battery of that capacity or slightly less.
- The AUX9 has the positive terminal on the left: compare it with your current battery.
- Length, width and height of the AUX9: 151 × 87 × 106 mm.

## Frequently asked questions about the Kronobat AUX9

### How much does the Kronobat AUX9 weigh?

2.87 kg, with 9 Ah of capacity.

### Which battery is equivalent to the Kronobat AUX9?

Only other AGM batteries with its dimensions and polarity: Varta AUX9, Exide EK091 and Tudor TK091. Neither an EFB nor a conventional battery replaces the AUX9.

### What is the cold cranking current of the Kronobat AUX9?

130 A to the EN standard, with 9 Ah capacity.

### Which side is the positive terminal on the Kronobat AUX9?

On the AUX9, 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.

## Keep comparing: alternatives to the AUX9

- [More auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [The whole Kronobat range](https://bateriasonline.es/en/kronobat-batteries)
- [Varta AUX9](https://bateriasonline.es/en/varta-aux9) · 9 Ah, 130 A, 151×87×106 mm
- [Exide EK091](https://bateriasonline.es/en/exide-ek091) · 9 Ah, 120 A, 150×90×105 mm

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