# Marine battery Fulbat FDM12-900 12V 180Ah 900A AGM CARBON ![Marine battery Fulbat FDM12-900 12V 180Ah 900A AGM CARBON](https://baterias.com/6394-home_default/battery-fulbat-fdm12-900-12v-180ah-900a.jpg) > Fulbat FDM12-900 marine battery 12V 180Ah 900A AGM CARBON. FDM Marine AGM Carbon range. Dimensions 512Γ—222Γ—218 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-fdm12-900-12v-180ah-900a - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-FDM12-900 - **MPN**: FDM12-900 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT FDM Marine AGM Carbon | | Voltage (V) | 12 V | | Largo | 512 mm | | Ancho | 222 mm | | Alto | 218 mm | | TecnologΓ­a | AGM Carbon | | Terminal layout | Positive left | | Terminal type | EN | | Cold cranking amps (EN) | 900 A | | Capacity (C20) | 180 Ah | ## Quick description **Fulbat FDM12-900 12V 180Ah 900A** 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 180 Ah C20 πŸ”‹ Cold cranking 900 A EN-1 πŸ“ Dimensions 512Γ—222Γ—218 mm βš™οΈ Technology AGM 🧭 Polarity Positive on the left ## Description ## Marine battery Fulbat FDM12-900 180Ah 900A 12V 12*V* Voltage 180*Ah* Capacity 900*A* Cold cranking With **180 Ah** at **12 V** and **900 A** of cold cranking current (EN), the **Fulbat FDM12-900** is built for motor and sailing boats, both for engine starting and onboard services. Measuring 512 Γ— 222 Γ— 218 mm and the positive terminal on the left, it is the direct replacement for boats fitted from the factory with a 180 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. ### Will it fit your current battery tray? It has external dimensions of 512 Γ— 222 Γ— 218 mm. 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 EN 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 the Fulbat FDM12-900 is for The Fulbat FDM12-900 is designed for motor and sailing boats, both for engine starting and onboard services. If it is your starter battery, run the services from a separate battery; if it is a service battery, avoid routinely discharging it beyond 50%. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has EN terminals. ### Technology inside the Fulbat FDM12-900 Fulbat builds the FDM12-900 to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position. 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. ### 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 FDM12-900 comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### How to make it last longer At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections. ### Shipping, delivery and returns 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 do I fit the FDM12-900 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. ### How long does the Fulbat FDM12-900 battery last? Expected lifespan of the Fulbat FDM12-900 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 FDM12-900 model? Dimensions (length Γ— width Γ— height) are 512Γ—222Γ—218 mm β€” also written as 512x222x218 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. ### Which batteries are equivalent to the Fulbat FDM12-900? 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€” over 25 years of experience validating automotive batteries. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-10-04*