# Motorcycle battery Motobatt MBTX20U 12V 21Ah 310A AGM ![Motorcycle battery Motobatt MBTX20U 12V 21Ah 310A AGM](https://baterias.com/882-home_default/battery-motobatt-mbtx20u-21ah.jpg) > Motobatt MBTX20U motorcycle battery 12V 21Ah 310A AGM. Replaces YTX20BS, YTX20LBS, YTX20HBS, YB16B, YB16LB, YB16CLB. QUADFLEX range. Dimensions 175×87×155 mm. **Category:** [Motorcycle Batteries](https://baterias.com/gb/motorcycle-batteries) → [MOTOBATT](https://baterias.com/gb/motobatt) - **Canonical URL**: https://baterias.com/gb/battery-motobatt-mbtx20u-21ah - **Language**: en-GB - **Brand**: MOTOBATT - **Reference**: BCOM-MOTOBATT-MBTX20U - **MPN**: MBTX20U - **Price**: 149,20 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | MOTOBATT | | Reference | MBTX20 U | | Model | MOTOBATT QUADFLEX | | Voltage (V) | 12 V | | Largo | 175 mm | | Ancho | 87 mm | | Alto | 155 mm | | Peso | 6.5 kg | | Tecnología | Quadflex | | JIS | YTX20 BS YTX20 LBS YTX20 HBS YB16 B YB16 LB YB16 CLB | | Cold cranking amps (EN) | 310 A | | Capacity (C20) | 21 Ah (c20) | | Capacity (C10) | 21 Ah (c10) | ## Quick description **Motobatt MBTX20U 12V 21Ah 310A** is a sealed motorcycle battery ready to fit, with the JIS reference your mechanic recognises at a glance. Vibration-resistant, keeps voltage during the winter off-season and cranks first time when you take it out for a ride. ### Why this motorcycle battery? - **Same JIS reference** as your bike's original — fits first time - **Sealed and ready to use** no acid handling, no refills - **Survives winter storage** holds charge through long off-season 🏍️ JIS code YTX20BS, YTX20LBS, YTX20HBS, YB16B, YB16LB, YB16CLB 🔌 Voltage 12 V ⚡ Capacity 21 Ah C20 🔋 Cold cranking 310 A EN-1 📏 Dimensions 175×87×155 mm ⚙️ Technology AGM Quadflex ⚖️ Weight 6,5 kg 🏷️ Model MOTOBATT QUADFLEX #️⃣ Mfr. reference MBTX20U ## Description ## Motorcycle battery Motobatt YTX20BS Quadflex 21Ah 310A 12V Equivalent JIS codes YTX20BS YTX20LBS YTX20HBS YB16B YB16LB YB16CLB 12*V* Voltage 21*Ah* Capacity 310*A* Cold cranking 6.50*kg* Weight With **21 Ah** at **12 V** and **310 A** of cold cranking current (EN), the **Motobatt YTX20BS** with AGM technology replaces the original battery of motorcycles, scooters, quads and personal watercraft. It replaces the original battery without adaptation in motorcycles with a 175 × 87 × 155 mm format: same 21 Ah capacity. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Same JIS code as the original battery: fits first time. - Resistant to the vibration typical of two wheels. - Energetic cranking for high-compression engines. ### What the Motobatt YTX20BS is for The Motobatt YTX20BS is a common replacement in motorcycles, scooters, quads and personal watercraft. If your bike spends the winter standing, a trickle charger stops it reaching spring flat. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 6.50 kg. ### The Motobatt YTX20BS: Quadflex range and AGM technology The **Quadflex** is the Motobatt range the YTX20BS belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle. AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### Will it fit your current battery tray? The Motobatt YTX20BS is made in the 175 × 87 × 155 mm format and weighs 6.50 kg. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### What Motobatt does differently Motobatt is the motorcycle battery specialist with Quadflex technology: four terminals that let you connect the battery in any position and a sealed AGM construction ready to fit. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### Usage and maintenance tips Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. Check the resting voltage before the season (above 12.6 V on a charged battery) and make sure the terminals are clean and tight. ### Manufacturer's warranty The Motobatt YTX20BS comes with the **manufacturer's official warranty**. The warranty does not cover discharge through prolonged inactivity: if the bike stands for months, use a trickle charger. ### Delivery times and returns Orders placed **before [[ks:cutoff]]** with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic and Canary Islands and the rest of the European Union allow 3 to 5 working days. You have **[[ks:return_days]] days** to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships. ## Frequently asked questions ### How is the Motobatt YB16CLB 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 this page. 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 — 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. ### What is the service life of the YB16CLB model? Expected lifespan of the Motobatt YB16CLB is 4 to 7 years in regular use (depends on technology and climate). 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 dimensions of the Motobatt YB16CLB battery? Dimensions (length × width × height) are 175×87×155 mm — also written as 175x87x155 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. ### Will the Motobatt YB16CLB 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 YB16CLB typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the YB16CLB 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. ## Equivalent batteries - [MOTOBATT MBTX20UHD](https://baterias.com/gb/battery-motobatt-mbtx20uhd-21ah) - [VARTA 518902026](https://baterias.com/gb/battery-varta-moto-12v-18ah-ytx20-4-ytx20-bs-518902026) ## Reviews - **Average rating**: 4.82 / 5 (28 reviews) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-28*