Varta AUX14 · Car battery 12V 13Ah 200A

Varta AUX14 Dynamic AUX (formerly Silver Dynamic Aux) 13Ah 200A 12V Car Battery

The Varta AUX14 car battery is the 12 V, 13 Ah and 200 A cold cranking (EN) model from Varta's Dynamic AUX (formerly Silver Dynamic Aux) range, designed to work as an auxiliary battery in cars with advanced Start-Stop and a great deal of electronics. It replaces the original battery in cars with the 150 × 87 × 146 mm format without any modifications: the same 13 Ah capacity and the same terminal layout (positive on the left).

In short: the Varta AUX14 (13 Ah, 200 A, 150 × 87 × 146 mm, positive terminal on the left) is one of the 50 best-selling batteries at baterias.com over the last 3 months. Verified equivalent alternatives: Exide EK131 and Tudor TK131.

• Supports the advanced Start-Stop system without voltage drops.
• Specific replacement for the backup battery fitted to the car at the factory.
• Auxiliary battery: it powers the vehicle's comfort and safety electronics.
• AGM technology: maintenance-free and resistant to cycling.

Vehicles compatible with the Varta AUX14 battery

The Varta AUX14 is compatible with more than 88 vehicles: it is fitted as standard or as a replacement by brands such as Mercedes-Benz, BMW, Audi, Volvo, Citroën and Alpina. If you are looking for a battery for Mercedes-Benz or BMW with these dimensions, the AUX14 is one of the usual replacement references. Not sure whether it is the right one for your car? Check in seconds by entering your registration number in our finder.

Format and fitting of the Varta AUX14

In terms of format, the Varta AUX14 measures 150 × 87 × 146 mm (length × width × height) and weighs 4,6 kg. The positive terminal on the left determines which side the cables end up on: it is the detail that causes the most purchasing mistakes, so it is worth checking before ordering. It uses a B00 hold-down and a Y4 terminal, the system that secures it to the vehicle's battery tray. Checking the three dimensions and the terminal positions before buying avoids the most common mistake when replacing a battery.

The Varta AUX14 and the Dynamic AUX range

The Dynamic AUX range brings together Varta's auxiliary batteries: these are not the main starter battery but the one that powers secondary functions (advanced Start-Stop, safety and comfort systems) in premium cars.

It is installed alongside the main battery and prevents voltage drops in the auxiliary electronics. It is worth establishing clearly whether your car needs this backup battery in addition to the starter one.

This series uses lead-acid technology with plates optimised for a good balance between cranking power and service life. It is the natural substitute when your car does not have Start-Stop and came with a standard battery as original equipment: the same philosophy, without paying over the odds for a chemistry you do not need. This battery used to belong to Varta's Silver Dynamic Aux range; following the brand's commercial renaming (2025), it forms part of the new Dynamic AUX series.

Why choose a Varta battery

Varta is a byword for reliability: original equipment in numerous European vehicles and one of the most proven brands on the market. Replacing your battery with a Varta restores OEM quality — the same performance as the factory-fitted unit — with the manufacturer's backing.

Behind Varta is Clarios, one of the largest manufacturers of starter batteries in the world and a supplier to the assembly lines of numerous car brands. That German engineering heritage translates into reliable starting year after year.

Varta's production combines automated lines with verification of more than 100 parameters per unit; that traceability is what underpins its reputation for reliable starting throughout the battery's life.

Manufacturer's warranty

The Varta AUX14 battery comes with the official manufacturer warranty.

Care and maintenance

To get the most out of it, keep the alternator in good order and avoid leaving lights or accessories on with the engine switched off. Repeated very short journeys are its main enemy: they stop the battery from recharging fully and shorten its life. If the car is going to stand unused for weeks, it is worth disconnecting a terminal or using a trickle charger so it does not discharge below the safe threshold. Checking that the terminals are clean and properly tightened also helps ensure reliable starting.