Varta YTX24HL-BS · Motorcycle battery (521908034) 12V 21Ah 340A AGM

Varta YTX24HL-BS Powersports AGM Active (formerly Powersports AGM High Performance) 21Ah 340A 12V Motorcycle Battery

The Varta YTX24HL-BS motorcycle battery (reference 521908034) is the 12 V, 21 Ah and 340 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 21 Ah capacity and the same terminal layout (positive on the right).

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

Vehicles compatible with the Varta YTX24HL-BS battery

The Varta YTX24HL-BS is compatible with more than 18 vehicles: it is fitted as standard or as a replacement by brands such as Harley-Davidson, Yamaha, Kawasaki, Ducati, Moto Guzzi and Honda. It is a benchmark option when you need a battery for Harley-Davidson, Yamaha or other models that use this same format. 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 YTX24HL-BS

The Varta YTX24HL-BS is made in the 175 × 87 × 154 mm format. 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. Checking the three dimensions and the terminal positions before buying avoids the most common mistake when replacing a battery.

The Varta YTX24HL-BS and the Powersports AGM Active range

The Powersports AGM Active range consists of AGM motorcycle batteries activated and charged at the factory, ready to fit. They unite the toughness of AGM technology with the convenience of immediate installation.

They are aimed at general use on motorbikes and scooters, with reliable starting and no maintenance from day one.

Unlike a car battery, what matters here is power density in a minimal size and resistance to vibration. It is the direct substitute for the original motorcycle battery, with the advantage of reliable starting even in the cold and after periods of inactivity. 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

Varta is an original equipment (OEM) supplier to a good share of Europe's car manufacturers: many cars leave the factory with a Varta fitted. Buying a replacement means, in most cases, refitting the original battery with the same quality and the brand's official warranty.

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.

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 YTX24HL-BS 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.