# Motorcycle battery Fulbat FTX4L-BS / FTZ5S-BS 12V 4.2Ah 50A AGM ![Motorcycle battery Fulbat FTX4L-BS / FTZ5S-BS 12V 4.2Ah 50A AGM](https://baterias.com/6105-home_default/battery-fulbat-ftx4l-bs-ftz5s-bs-12v-4-2ah-50a.jpg) > Fulbat FTX4L-BS / FTZ5S-BS motorcycle battery 12V 4.2Ah 50A AGM. Motorcycle MF range. Dimensions 113×70×85 mm, + terminal on the right. Verified OEM fitment. **Category:** [Motorcycle Batteries](https://baterias.com/gb/motorcycle-batteries) → [FULBAT](https://baterias.com/gb/fulbat) - **Canonical URL**: https://baterias.com/gb/battery-fulbat-ftx4l-bs-ftz5s-bs-12v-4-2ah-50a - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-FTX4L-BS / FTZ5S-BS - **MPN**: FTX4L-BS / FTZ5S-BS - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT Motorcycle MF | | Voltage (V) | 12 V | | Largo | 113 mm | | Ancho | 70 mm | | Alto | 85 mm | | Tecnología | AGM | | Terminal layout | Positive right | | Cold cranking amps (EN) | 50 A | | Capacity (C20) | 4.2 Ah | | Capacity (C10) | 4 Ah (c10) | ## Quick description **Fulbat FTX4L-BS / FTZ5S-BS 12V 4,2Ah 50A** 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 🔌 Voltage 12 V ⚡ Capacity 4,2 Ah C20 🔋 Cold cranking 50 A EN-1 📏 Dimensions 113×70×85 mm ⚙️ Technology AGM 🧭 Polarity Positive on the right ## Description ## Motorcycle battery Fulbat FTX4L-BS / FTZ5S-BS 4.2Ah 50A 12V 12*V* Voltage 4.2*Ah* Capacity 50*A* Cold cranking The **Fulbat FTX4L-BS / FTZ5S-BS motorcycle battery** is rated at **12 V**, **4.2 Ah** and **50 A** of cold cranking current (EN), and is designed for motorcycles, scooters, quads and personal watercraft. Its 113 × 70 × 85 mm and the positive terminal on the right make it the exact replacement for the 4.2 Ah battery fitted as standard to many motorcycles. - Compact and lightweight format. - Holds its charge through winter storage. - Sealed and ready to fit, no acid handling. - AGM: faster recharging and better cycle resistance than a conventional battery. ### What the Fulbat FTX4L-BS / FTZ5S-BS is for With 4.2 Ah, the Fulbat FTX4L-BS / FTZ5S-BS covers the starting of motorcycles, scooters, quads and personal watercraft. The JIS code on your current battery label is the safest way to confirm equivalence. ### Will it fit your current battery tray? The Fulbat FTX4L-BS / FTZ5S-BS is made in the 113 × 70 × 85 mm format. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. 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. ### Technology inside the Fulbat FTX4L-BS / FTZ5S-BS Fulbat builds the FTX4L-BS / FTZ5S-BS to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position. AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly. ### What Fulbat does differently French brand Fulbat is a European reference in motorcycle, garden and leisure batteries: compact ranges, clear JIS codes and a consistent quality that workshops know well. We guarantee that every Fulbat arrives new, charged and with the manufacturer's full warranty. ### Manufacturer's warranty The Fulbat FTX4L-BS / FTZ5S-BS 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. ### Usage and maintenance tips If the bike spends the winter standing, connect a trickle charger: deep discharge through inactivity is the first cause of premature failure. Check the resting voltage before the season (above 12.6 V on a charged battery) and make sure the terminals are clean and tight. ### When you get it and how to return it Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### How is the Fulbat FTX4L-BS / FTZ5S-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 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 Fulbat FTX4L-BS / FTZ5S-BS battery last? Expected lifespan of the Fulbat FTX4L-BS / FTZ5S-BS 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 Fulbat FTX4L-BS / FTZ5S-BS battery? Dimensions (length × width × height) are 113×70×85 mm — also written as 113x70x85 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. ### Is the FTX4L-BS / FTZ5S-BS valid for my vehicle? 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 FTX4L-BS / FTZ5S-BS typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Fulbat FTX4L-BS / FTZ5S-BS? 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. ## 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 · 2026-09-30*