# Lawnmower battery Fulbat SLA12-20 12V 21.1Ah 180A AGM ![Lawnmower battery Fulbat SLA12-20 12V 21.1Ah 180A AGM](https://baterias.com/6147-home_default/battery-fulbat-sla12-20-12v-21-1ah-180a.jpg) > Fulbat SLA12-20 lawnmower battery 12V 21.1Ah 180A AGM. Lawn & Garden SLA range. Dimensions 182×77×168 mm, + terminal on the right. 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-sla12-20-12v-21-1ah-180a - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-SLA12-20 - **MPN**: SLA12-20 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT Lawn & Garden SLA | | Voltage (V) | 12 V | | Largo | 182 mm | | Ancho | 77 mm | | Alto | 168 mm | | Tecnología | AGM | | Terminal layout | Positive right | | Cold cranking amps (EN) | 180 A | | Capacity (C20) | 21.1 Ah | | Capacity (C10) | 20 Ah (c10) | ## Quick description **Fulbat SLA12-20 12V 21Ah 180A** 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 12 V ⚡ Capacity 21 Ah C20 🔋 Cold cranking 180 A EN-1 📏 Dimensions 182×77×168 mm ⚙️ Technology AGM 🧭 Polarity Positive on the right 🏷️ Model FULBAT Lawn & Garden SLA #️⃣ Mfr. reference SLA12-20 ## Description ## Lawn mower battery Fulbat SLA12-20 21.1Ah 180A 12V 12*V* Voltage 21.1*Ah* Capacity 180*A* Cold cranking With **21.1 Ah** and **180 A** of cold cranking current (EN), the **Fulbat SLA12-20** starts ride-on mowers, tillers and garden machinery after months of storage. It measures 182 × 77 × 168 mm and the positive terminal on the right, the format sought by anyone replacing a 21.1 Ah battery in ride-on mowers. - Good tolerance to self-discharge. - Compact format for small trays. - Reliable starting after months of winter storage. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. ### Dimensions, polarity and mounting It has external dimensions of 182 × 77 × 168 mm. 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. ### What the Fulbat SLA12-20 is for The Fulbat SLA12-20 is designed for ride-on mowers, tillers and garden machinery. After winter, a full charge before the first start avoids surprises. ### Technology inside the Fulbat SLA12-20 Within the Fulbat catalogue, the SLA12-20 is the 21.1 Ah model designed for this application. In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery. ### Why choose Fulbat batteries 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. All the Fulbat batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Manufacturer's warranty The Fulbat SLA12-20 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. ### Care and maintenance 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. ### Delivery times and returns Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### How is the Fulbat SLA12-20 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 SLA12-20 battery last? Expected lifespan of the Fulbat SLA12-20 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 size is this battery? Dimensions (length × width × height) are 182×77×168 mm — also written as 182x77x168 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 SLA12-20 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 SLA12-20 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the SLA12-20 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 — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-30*