Varta YTX9(FA) · Motorcycle battery (508909013) 12V 8Ah 135A AGM

Varta YTX9 Powersports AGM Active (formerly Powersports AGM High Performance) 8Ah 135A 12V Motorcycle Battery

The Varta YTX9 motorcycle battery (reference 508909013) is the 12 V, 8 Ah model with 135 A of cold cranking power (EN) from Varta's Powersports AGM Active (formerly Powersports AGM High Performance) range, designed for motorcycles, scooters, quads and personal watercraft. It replaces the original battery in motorcycles with the 151 × 87 × 106 mm format without any modifications: the same 8 Ah capacity and the same terminal layout (positive on the left).

In short: the Varta YTX9(FA) (8 Ah, 135 A, 151 × 87 × 106 mm, positive terminal on the left). Verified equivalent alternatives: Varta YT12A-BS and Varta YTX9-BS.

• Performs well in the cold and after periods of inactivity.
• High cranking peak in a compact, lightweight format.
• Direct replacement for the original motorbike, scooter or quad battery.
• Construction built to withstand the vibration typical of two-wheelers.

Vehicles that take the Varta YTX9 battery

This battery is listed as compatible with more than 116 vehicles from manufacturers such as Honda, KTM, Kawasaki, Suzuki, Yamaha and Triumph Motorcycles. It is a go-to choice when you need a battery for a Honda, a KTM or other models that take this same format. It also appears as a replacement in vehicles from Kymco, SYM, Hyosung, BMW, Sachs, Vespa, MBK and Daelim, among other manufacturers. Not sure whether it is the right one for your bike? Check in seconds by entering your registration in our finder.

Format and fitting of the Varta YTX9

Its external dimensions are 151 × 87 × 106 mm. The positive terminal on the left determines which side the cables end up on: it is the detail behind most mistaken purchases, so it is worth checking before ordering. It uses a B00 hold-down, the system that anchors it to the vehicle's battery tray. Before replacing it, measure the space your current battery sits in: if it matches on all three dimensions and on the terminal layout, the swap is direct and needs no adapters.

The Varta YTX9 and the Powersports AGM Active range

The Powersports AGM Active series is Varta's AGM line for motorcycles that arrives activated and charged from the outset: it fits straight on, with no acid to add and no charging before use. It combines the robustness of AGM (resistance to vibration and to deep discharge) with maximum ease of installation.

In the new portfolio it also absorbs the former high-performance versions (AGM High Performance), so it covers everything from general use to large-capacity, custom and trail bikes with heavy starting demands.

On two wheels, vibration and extreme temperatures take a heavy toll on the battery. This range reinforces the internal plate mounting and seals the unit to withstand that use, delivering the instant burst of cranking power a motorbike or quad engine needs after weeks standing idle. This battery used to belong to Varta's Powersports AGM High Performance range; following the brand's change of commercial naming (2025), it forms part of the new Powersports AGM Active series.

Why choose a Varta battery

A good share of the vehicles on Europe's roads left the factory with a Varta fitted: the brand has been supplying the assembly lines of the leading car groups for decades. Replacing with a Varta is, in practice, giving the vehicle back the battery its manufacturer intended.

Varta batteries are made under the Clarios group with German technology and quality controls that make them one of the best-selling choices in Europe. As a lead battery, it is 100% recyclable through any collection point.

More than 100 manufacturing parameters are checked on every Varta battery before it leaves the plant, a level of rigour that explains why so many workshops and manufacturers trust the brand as their first-choice replacement.

Manufacturer's warranty

The Varta YTX9 battery comes with the official manufacturer warranty.

Care and maintenance

If the bike goes unused for long spells, a trickle charger greatly extends the battery's life and prevents sulphation. Storing it somewhere dry and checking the terminals at the start of each season helps it start first time. Motorcycle batteries suffer in the cold and when left idle: in winter, a maintenance charger stops the battery from discharging completely. With this care, it will typically deliver well over several years of service.