# Lawnmower battery Fulbat FL-HU03 18V 4Ah Li-Ion ![Lawnmower battery Fulbat FL-HU03 18V 4Ah Li-Ion](https://baterias.com/6289-home_default/battery-fulbat-fl-hu03-18v-4ah.jpg) > Fulbat FL-HU03 lawnmower battery 18V 4Ah Li-Ion. Robot Mower range. Dimensions 146×67×38 mm. For garden machinery. **Category:** [Lawnmower Batteries](https://baterias.com/gb/lawnmower-batteries) → [FULBAT](https://baterias.com/gb/fulbat) - **Canonical URL**: https://baterias.com/gb/battery-fulbat-fl-hu03-18v-4ah - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-FL-HU03 - **MPN**: FL-HU03 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT Robot Mower | | Voltage (V) | 18 V | | Largo | 146.2 mm | | Ancho | 67.6 mm | | Alto | 38.8 mm | | Tecnología | Li-Ion | | Capacity (C20) | 4 Ah | | Energy (Wh) | 72 Wh | ## Quick description **Fulbat FL-HU03 18V 4Ah** is a compact garden battery: strong cranking reserve and good tolerance to long idle periods between seasons. ## Why this lawnmower 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 18 V ⚡ Capacity 4 Ah C20 📏 Dimensions 146×67×38 mm ⚙️ Technology LI-ION 🏷️ Model FULBAT Robot Mower #️⃣ Mfr. reference FL-HU03 ## Description ## Lawn mower battery Fulbat FL-HU03 4Ah 18V 18*V* Voltage 4*Ah* Capacity The **Fulbat FL-HU03** battery is rated at **18 V**, **4 Ah** and is designed for ride-on mowers, tillers and garden machinery. It replaces the original battery without adaptation in ride-on mowers with a 146 × 67 × 38 mm format: same 4 Ah capacity. - Reliable starting after months of winter storage. - Compact format for small trays. - Sealed and maintenance-free. - Resistant to garden-engine vibration. ### What the Fulbat FL-HU03 is for With 4 Ah, the Fulbat FL-HU03 starts ride-on mowers, tillers and garden machinery and copes with garden-engine vibration. ### Technology inside the Fulbat FL-HU03 The FL-HU03 is one of the Fulbat references for this type of use; it shares the same manufacturing and quality-control criteria as the rest of the brand's catalogue. ### Size, terminals and hold-down of the Fulbat FL-HU03 In terms of format, the Fulbat FL-HU03 measures 146 × 67 × 38 mm (length × width × height). 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 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. ### How to make it last longer Disconnect or remove the battery over winter and give it a maintenance charge before storing it. Check the voltage before the first start of the season and clean the terminals. ### Manufacturer's warranty The Fulbat FL-HU03 comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you. ### 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 FL-HU03 battery installed in the vehicle? In most trucks 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 trucks with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Fulbat FL-HU03 battery last? Expected lifespan of the Fulbat FL-HU03 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 FL-HU03 model? Dimensions (length × width × height) are 146×68×39 mm — also written as 146x68x39 mm — following the European DIN standard. Always measure the space in your truck before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Is the FL-HU03 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 FL-HU03 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the FL-HU03 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 trucks. 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 — automotive battery specialists since 2015. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-13*