Varta YTX24HL-BS · Motorcycle battery (521908034) 12V 21Ah 340A AGM
Motorcycle battery Varta YTX24HL-BS (521908034) 12V 21Ah 340A AGM images
Specifications
| Brand | VARTA |
|---|---|
| Part number | 521908034 |
| Voltage (V) | 12 |
| Capacity (C20) | 21Ah (c20) |
| Cold cranking amps (EN) | 340A |
| Technology | AGM |
| Length | 175.00 mm |
| Width | 87.00 mm |
| Height | 154.00 mm |
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Varta YTX24HL-BS 12V 21Ah 340A is a motorcycle starter battery with standard JIS code (the one on your bike's original label). Ready to use, sealed and vibration-resistant. Fits any model that takes the same JIS reference — the code your mechanic recognises at a glance.
Why this motorcycle battery?
- Same JIS referenceas your bike's original — fits first time
- Sealed and ready to useno acid handling, no refills
- Survives winter storageholds charge through long off-season
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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).
In short: the Varta YTX24HL-BS (21 Ah, 340 A, 205 × 90 × 164 mm, positive terminal on the right). Verified equivalent alternatives: Exide AGM12-23 and Exide ETX24HL-BS.
- 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.
Technical sheet
Download the official technical sheet for this battery with all the manufacturer data.
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ReferenceBCOM-VARTA-521908034
Data sheet
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BrandVARTA
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Reference521908034
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ModelVarta Powersports AGM Active
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Voltage (V)12
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Length175.00 mm
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Width87.00 mm
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Height154.00 mm
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TechnologyAGM
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EAN4016987149768
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Terminal layoutPositive terminal on the right
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JISYTX24HL-BS
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Hold-downB00
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Cold cranking amps (EN)340A
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Capacity (C20)21Ah (c20)
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ETN521908034A514
Specific References
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EAN134016987149768
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MPN521908034
Codes and references Varta 521908034
| Brand | Varta · see all Varta batteries |
|---|---|
| Manufacturer range | Powersports AGM Active (formerly Powersports AGM High Performance) |
| Manufacturer part number (MPN) | 521908034 |
| Also known as | Varta Powersports AGM High Performance 521908034 · Varta Powersports AGM Active 521908034 |
| JIS equivalents | YTX24HL-BS |
| ETN code | 521908034A514 (short form 521 908 034) |
| EAN-13 barcode | 4016987149768 |
| Dimensions (length × width × height) | 205 × 90 × 164 mm (205x90x164) |
Comparison: Varta 521908034 vs equivalents
The Varta 521908034 is interchangeable with these equivalent references: AGM12-23 (Exide), ETX24HL-BS (Exide).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Varta
521908034
This battery
|
12V 21Ah 340A | AGM | |
Exide
AGM12-23
|
12V 21Ah 350A | AGM | €91.30 |
Exide
ETX24HL-BS
|
12V 21Ah 350A | AGM | €82.80 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
Recommended accessories
Compatible vehicles
The Varta 521908034 fits 19 vehicles. Most searched below:
Frequently asked questions
Is the Varta YTX24HL-BS an AGM battery and what are the benefits of AGM?
Yes. The YTX24HL-BS from Varta uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for motorcycles with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions.
How is the Varta YTX24HL-BS battery installed in the vehicle?
In most motorcycles it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on our blog. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — with positive on the right match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On motorcycles with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How many years does this battery last?
Expected lifespan of the Varta YTX24HL-BS is 5 to 8 years in mild-climate motorcycle use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the measurements of the YTX24HL-BS model?
Dimensions (length × width × height) are 205×90×164 mm — also written as 205x90x164 mm — following the European DIN standard. Always measure the space in your motorcycle before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
Which side is the positive terminal on this battery?
Polarity: positive on the right. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk.
Does this battery fit my motorcycle?
Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The YTX24HL-BS fits 19 verified vehicle versions in our database.
What are the equivalents of the YTX24HL-BS model?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop motorcycles. See the "Equivalents" section to view recommended options at the same performance level.
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