# Motorcycle battery Fulbat FB4L-B 12V 4.2Ah 56A ![Motorcycle battery Fulbat FB4L-B 12V 4.2Ah 56A](https://baterias.com/6089-home_default/battery-fulbat-fb4l-b-12v-4-2ah-56a.jpg) > Fulbat FB4L-B motorcycle battery 12V 4.2Ah 56A. Motorcycle DRY range. Dimensions 120×70×92 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-fb4l-b-12v-4-2ah-56a - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-FB4L-B - **MPN**: FB4L-B - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT Motorcycle DRY | | Voltage (V) | 12 V | | Largo | 120 mm | | Ancho | 70 mm | | Alto | 92 mm | | Tecnología | Lead-acid | | Terminal layout | Positive right | | Cold cranking amps (EN) | 56 A | | Capacity (C20) | 4.2 Ah | | Capacity (C10) | 4 Ah (c10) | ## Quick description **Fulbat FB4L-B 12V 4,2Ah 56A** 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 56 A EN-1 📏 Dimensions 120×70×92 mm ⚙️ Technology Lead-acid 🧭 Polarity Positive on the right ## Description ## Motorcycle battery Fulbat FB4L-B 4.2Ah 56A 12V 12*V* Voltage 4.2*Ah* Capacity 56*A* Cold cranking The **Fulbat FB4L-B motorcycle battery** is rated at **12 V**, **4.2 Ah** and **56 A** of cold cranking current (EN), and is designed for motorcycles, scooters, quads and personal watercraft. It measures 120 × 70 × 92 mm and the positive terminal on the right, the format sought by anyone replacing a 4.2 Ah battery in motorcycles. - Same JIS code as the original battery: fits first time. - Conventional lead-acid: the most proven and economical technology. - Energetic cranking for high-compression engines. - Resistant to the vibration typical of two wheels. ### What the Fulbat FB4L-B is for With 4.2 Ah, the Fulbat FB4L-B 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. ### Dimensions, polarity and mounting In terms of format, the Fulbat FB4L-B measures 120 × 70 × 92 mm (length × width × height). 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. 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 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. ### Technology inside the Fulbat FB4L-B Fulbat builds the FB4L-B to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position. The conventional lead-acid battery remains the most widespread technology thanks to its balance of capacity, cranking current and price. Well maintained and kept charged, it offers years of reliable service in vehicles without Start-Stop. ### How to make it last longer Avoid repeated cranking attempts on a cold bike for long: if it does not start on the third try, let the battery rest for a minute. 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 Fulbat FB4L-B 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. ### When you get it and how to return it 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 Fulbat FB4L-B 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 FB4L-B battery last? Expected lifespan of the Fulbat FB4L-B 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 measurements of the FB4L-B model? Dimensions (length × width × height) are 120×70×92 mm — also written as 120x70x92 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 FB4L-B 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 FB4L-B typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Fulbat FB4L-B? 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 · 2026-10-04*