Varta YTX20L-4 · Motorcycle battery (518909027) 12V 18Ah 270A AGM

Varta YTX20L-4 Powersports AGM Active (formerly Powersports AGM High Performance) 18Ah 270A 12V Motorcycle Battery

The Varta YTX20L-4 motorcycle battery (reference 518909027) is the 12 V, 18 Ah and 270 A cold cranking (EN) model 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 175 × 87 × 154 mm format without any modifications: the same 18 Ah capacity and the same terminal layout (positive on the right).

In short: the Varta YTX20L-4 (18 Ah, 270 A, 175 × 87 × 154 mm, positive terminal on the right). Verified equivalent alternatives: Varta YTX20L-BS and Varta YTX20HL-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 compatible with the Varta YTX20L-4 battery

According to our database, the Varta YTX20L-4 is fitted to more than 103 vehicles from brands such as Harley-Davidson, Moto Guzzi, Moto-Morini, Indian, Honda and Triumph Motorcycles, among others. It is a benchmark option when you need a battery for Harley-Davidson, Moto Guzzi or other models that use this same format. Added to that list are models from Yamaha, Kawasaki, Hercules, Buell, Laverda, Cagiva Motorcycles and Victory Motorcycles. Not sure whether it is the right one for your motorbike? Check in seconds by entering your registration number in our finder.

Format and fitting of the Varta YTX20L-4

Its external dimensions are 175 × 87 × 154 mm. The positive terminal on the right 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, the system that secures it to the vehicle's battery tray. For the replacement to be a direct fit, the space taken by your current battery must respect those three dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

The Varta YTX20L-4 and the Powersports AGM Active range

The Powersports AGM Active series is Varta's AGM motorcycle line that arrives activated and charged from the factory: it fits straight in, with no acid to add and no charging before use. It combines the robustness of AGM (resistance to vibration and to discharges) with the greatest possible ease of installation.

In the new portfolio it also consolidates the former high-performance versions (AGM High Performance), so it covers everything from general use to large-capacity, custom and trail bikes with high cranking 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 commercial renaming (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 spent decades supplying the assembly lines of the leading automotive groups. Fitting a Varta is, in practice, giving the vehicle back the battery its manufacturer intended.

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.

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 YTX20L-4 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.