# VARTA Dynamic AUX Batteries

> VARTA Dynamic AUX auxiliary batteries for stabilizing the onboard network in vehicles with start-stop. Compact, in AGM and lead-acid.

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- **Language**: en-GB

## Description

Dynamic AUX batteries are auxiliary batteries: they do not start the engine, but power the vehicle's electronic systems when the engine is off or during the start itself.

## Technology

They are compact units, in AGM or lead-acid depending on the reference, designed to stabilize the onboard electrical network. In vehicles with start-stop, they prevent the voltage drop during starting from restarting the radio, navigation system, or assistance systems. Many premium manufacturers install them as standard in an independent housing.

## Applications

- Premium vehicles with start-stop and auxiliary battery as standard
- Onboard voltage stabilization systems
- Powering comfort electronics with the engine off
- Replacement of the original backup battery

## The range in figures

References 3
Capacity 9 – 35 Ah
Cold cranking 130 – 520 A (EN)
Voltage 12 V
Technology AGM, PLOMO/ACIDO

## How to choose

The auxiliary battery is specific to each model: check the original reference before replacing it, because dimensions and terminal type vary greatly between manufacturers and there is no standard format.

## Naming and equivalences

Dynamic AUX is the new designation of the VARTA Silver Dynamic Aux. It is not a starting battery: it is the auxiliary battery that stabilizes the on-board network in vehicles with start-stop.

## Frequently asked questions

### What is an auxiliary battery used for?

It powers the vehicle's electronics when the engine is off and during the start itself. It prevents voltage drop from restarting the radio, the navigation system, or the driving assistance systems.

### Can an auxiliary battery start the engine?

No. Its capacity and starting current are sized to power comfort electronics, not to move the starter motor.

### Which range replaces the VARTA Silver Dynamic Aux?

The VARTA Dynamic AUX, with the same references.

### How do I choose the correct auxiliary battery?

By the original reference of the vehicle. There is no standard format: dimensions, capacity, and terminal type vary greatly between manufacturers and are not interchangeable.

## Products in this category

| Product | Brand | Price |
|---|---|---|
| [Car battery Varta AUX14 12V 13Ah 200A AGM](https://baterias.com/gb/battery-varta-aux14-12v-13ah-200a) | VARTA | 69,54 € |
| [Car battery Varta AUX1 12V 35Ah 520A](https://baterias.com/gb/battery-varta-aux1-12v-35ah-520a) | VARTA | 146,80 € |
| [Car battery Varta AUX9 12V 9Ah 130A](https://baterias.com/gb/battery-varta-aux9-12v-9ah-130a) | VARTA | 58,42 € |

## Technical team (editorial authorship)

The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries.

→ https://baterias.com/gb/technical-team

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*baterias.com — Automotive batteries · 2026-08-01*