# Marine battery Fulbat FDM12-800-M27 12V 92Ah 800A AGM CARBON ![Marine battery Fulbat FDM12-800-M27 12V 92Ah 800A AGM CARBON](https://baterias.com/6391-home_default/battery-fulbat-fdm12-800-m27-12v-92ah-800a.jpg) > Fulbat FDM12-800-M27 marine battery 12V 92Ah 800A AGM CARBON. FDM Marine AGM Carbon range. Dimensions 306Γ—168Γ—233 mm, + terminal on the left. **Category:** [Marine Dual Purpose Batteries](https://baterias.com/gb/marine-dual-purpose-batteries) β†’ [FULBAT](https://baterias.com/gb/fulbat) - **Canonical URL**: https://baterias.com/gb/battery-fulbat-fdm12-800-m27-12v-92ah-800a - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-FDM12-800-M27 - **MPN**: FDM12-800-M27 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT FDM Marine AGM Carbon | | Voltage (V) | 12 V | | Largo | 306 mm | | Ancho | 168 mm | | Alto | 233 mm | | TecnologΓ­a | AGM Carbon | | Terminal layout | Positive left | | Terminal type | DT | | Cold cranking amps (EN) | 800 A | | Capacity (C20) | 92 Ah | ## Quick description **Fulbat FDM12-800-M27 12V 92Ah 800A** is a quality battery with official manufacturer warranty, confirmed stock and 24-48 h delivery across the peninsula. ## Why this battery? - **Tested and certified** to European EN standards for maximum reliability - **Sealed and maintenance-free** ready to use out of the box - **Long working life** optimised for its real-world use case πŸ”Œ Voltage 12 V ⚑ Capacity 92 Ah C20 πŸ”‹ Cold cranking 800 A EN-1 πŸ“ Dimensions 306Γ—168Γ—233 mm βš™οΈ Technology AGM 🧭 Polarity Positive on the left ## Description ## Marine battery Fulbat FDM12-800-M27 92Ah 800A 12V 12*V* Voltage 92*Ah* Capacity 800*A* Cold cranking With **92 Ah** at **12 V** and **800 A** of cold cranking current (EN), the **Fulbat FDM12-800-M27** is built for motor and sailing boats, both for engine starting and onboard services. Measuring 306 Γ— 168 Γ— 233 mm and the positive terminal on the left, it is the direct replacement for boats fitted from the factory with a 92 Ah battery of this format. - Sealed: no spills or gases in the locker. - Resistant to humidity and salt air. - AGM: faster recharging and better cycle resistance than a conventional battery. - Ready for starting outboard and inboard engines. ### What the Fulbat FDM12-800-M27 is for On board, the Fulbat FDM12-800-M27 provides 92 Ah with a case reinforced against vibration and swell. Keep the terminals clean and protected from salt humidity. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has DT terminals. ### Technology inside the Fulbat FDM12-800-M27 The FDM12-800-M27 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. 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. ### Size, terminals and hold-down of the Fulbat FDM12-800-M27 In terms of format, the Fulbat FDM12-800-M27 measures 306 Γ— 168 Γ— 233 mm (length Γ— width Γ— height). The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses DT terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery. ### 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. ### Care and maintenance At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. ### Official warranty The Fulbat FDM12-800-M27 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### Shipping, delivery and returns 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 do I fit the FDM12-800-M27 model in my car? In most cars 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 (βˆ’) 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 β€” match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### What is the service life of the FDM12-800-M27 model? Expected lifespan of the Fulbat FDM12-800-M27 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 FDM12-800-M27 model? Dimensions (length Γ— width Γ— height) are 306Γ—168Γ—233 mm β€” also written as 306x168x233 mm β€” following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### What are the equivalents of the FDM12-800-M27 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 β€” an EFB cannot be replaced with a conventional battery in Start-Stop cars. 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 β€” automotive battery specialists since 2015. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-10-10*