# Motorcycle battery Motobatt MBTX20UHD 12V 21Ah 310A AGM ![Motorcycle battery Motobatt MBTX20UHD 12V 21Ah 310A AGM](https://baterias.com/881-home_default/battery-motobatt-mbtx20uhd-21ah.jpg) > Motobatt MBTX20UHD 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-mbtx20uhd-21ah - **Language**: en-GB - **Brand**: MOTOBATT - **Reference**: BCOM-MOTOBATT-MBTX20UHD - **MPN**: MBTX20UHD - **Price**: 149,20 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | MOTOBATT | | Reference | MBTX20 UHD | | 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 MBTX20UHD 12V 21Ah 310A** 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 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 MBTX20UHD ## 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 The **Motobatt YTX20BS motorcycle battery** is rated at **12 V**, **21 Ah** and **310 A** of cold cranking current (EN) from the **Quadflex** range, and is designed for motorcycles, scooters, quads and personal watercraft. Measuring 175 × 87 × 155 mm, it is the direct replacement for motorcycles fitted from the factory with a 21 Ah battery of this format. - Holds its charge through winter storage. - Compact and lightweight format. - AGM: faster recharging and better cycle resistance than a conventional battery. - Sealed and ready to fit, no acid handling. ### Size, terminals and hold-down of the Motobatt YTX20BS It has external dimensions of 175 × 87 × 155 mm and weighs 6.50 kg. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### What the Motobatt YTX20BS is for Designed for motorcycles, scooters, quads and personal watercraft, the Motobatt YTX20BS replaces the original battery of bikes that use this code or format. Check the position of the positive terminal before ordering. 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 YTX20BS is part of the Motobatt **Quadflex** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. 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. ### Motobatt: the maker behind the YTX20BS 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. We guarantee that every Motobatt arrives new, charged and with the manufacturer's full warranty. ### 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. ### How to make it last longer Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. If the bike spends the winter standing, connect a trickle charger: deep discharge through inactivity is the first cause of premature failure. ### Shipping, delivery 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. ### How long does the Motobatt YB16CLB battery last? 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. ### 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 YB16CLB typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Motobatt YB16CLB? 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 MBTX20U](https://baterias.com/gb/battery-motobatt-mbtx20u-21ah) - [VARTA 518902026](https://baterias.com/gb/battery-varta-moto-12v-18ah-ytx20-4-ytx20-bs-518902026) ## Reviews - **Average rating**: 4.79 / 5 (31 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*