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

![Varta AUX9 · Auxiliary battery 12V 9Ah 130A](https://bateriasonline.es/1161-home_default/varta-aux9.jpg)

> Varta AUX9 (ETN 509106013): 9 Ah auxiliary battery, 130 A (EN), 151×87×106 mm, positive terminal on the left, AGM. Equivalent to Exide EK091.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-aux9
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-AUX9
- **EAN**: 4016987167823
- **MPN**: AUX9
- **Price**: 57,73 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA Dynamic AUX |
| 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 |
| ETN code | 509106013 |

## Quick description

The Varta AUX9 (ETN 509 106 013, also written 509106013) 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 Varta AUX9 is for

The Varta AUX9 is an auxiliary vehicle battery: it powers back-up functions such as Start-Stop, electric steering or the emergency system while the main battery starts the engine. Without it, Start-Stop or back-up warnings appear on the dashboard.
Varta lists the AUX9 in its Dynamic AUX line. [More Varta batteries](https://bateriasonline.es/en/varta-batteries)

## What it means that the AUX9 is AGM

The AUX9 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the AUX9 can be fitted in the boot or under a seat with no risk of spills.

## Equivalents and alternatives to the Varta 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) |
|---|---|---|---|---|
| Kronobat 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 Varta AUX9

Look for any of these AUX9 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | AUX9 |
|---|---|
| ETN code | 509106013 (also 509 106 013) |
| EAN | 4016987167823 |
| Case size according to Varta | YTX9 |
| UK code | YTX9 |
| Base hold-down | B00 |
| Also known as | Varta 509106013 · Varta 509 106 013 · YTX9 |
| Not to be confused with | Varta 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.
- Your current battery should say about 9 Ah; a little more is also fine.
- With the terminals facing you, the positive terminal of the AUX9 is on the left.
- Measure the space: the AUX9 takes up 151 × 87 × 106 mm.

## Frequently asked questions about the Varta AUX9

### What does the code 509 106 013 on the Varta AUX9 mean?

It is its ETN (European Type Number), also written 509106013. The first three digits (509) encode voltage and capacity: 12 V and 9 Ah (5xx = under 100 Ah, 6xx = 100 to 199 Ah, 7xx = 200 Ah or more). The middle group (106) identifies the specific model within that capacity, and the last three digits (013) multiplied by 10 give the cold cranking current: 130 A.

### How much does the Varta AUX9 weigh?

2.87 kg, with 9 Ah of capacity.

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

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

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

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

### Which side is the positive terminal on the Varta 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.

### Is the auxiliary battery replaced together with the main one?

Not necessarily, but they usually age together. If the main battery is over five years old, check the auxiliary one too.

## Other options if you are unsure about the AUX9

- [More auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [More Varta models](https://bateriasonline.es/en/varta-batteries)
- [Kronobat AUX9](https://bateriasonline.es/en/kronobat-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*