# Marine battery Exide EX900 12V 50Ah 800A AGM ![Marine battery Exide EX900 12V 50Ah 800A AGM](https://baterias.com/3468-home_default/battery-exide-ex900-12v-50ah-800a.jpg) > Exide EX900 marine battery 12V 50Ah 800A AGM. Maxxima range. Dimensions 260×173×206 mm. Vibration resistant, deep-discharge capable; cranking and house duties. **Category:** [Boat Batteries](https://baterias.com/gb/boat-batteries) → [EXIDE](https://baterias.com/gb/exide) - **Canonical URL**: https://baterias.com/gb/battery-exide-ex900-12v-50ah-800a - **Language**: en-GB - **Brand**: EXIDE - **Reference**: BCOM-EXIDE-EX900 - **EAN**: 3661024036603 - **MPN**: EX900 - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | EXIDE | | Reference | EX900 | | Model | EXIDE Maxxima | | Voltage (V) | 12 V | | Largo | 260 mm | | Ancho | 173 mm | | Alto | 206 mm | | Peso | 17.9 kg | | Tecnología | AGM | | EAN | 3661024036603 | | Terminal layout | 9 | | Terminal type | SAE S 3/8" side Terminal | | Hold down | B7 | | Cold cranking amps (EN) | 800 A | | Capacity (C20) | 50 Ah (c20) | | Case type | G34 | ## Quick description **Exide EX900 12V 50Ah 800A** is a marine battery, vibration- and deep-discharge resistant, suitable both for outboard engine starting and for onboard auxiliary services (navigation lights, GPS, sonar, fridge). Sealed and maintenance-free. ## Why this marine battery? - **Marine design** built for boat swell and vibration - **Dual function** starts the engine and powers onboard services - **Sealed and safe** maintenance-free even when the boat rolls 🔌 Voltage 12 V ⚡ Capacity 50 Ah C20 🔋 Cold cranking 800 A EN-1 📏 Dimensions 260×173×206 mm ⚙️ Technology AGM ⚖️ Weight 17,9 kg 🏷️ Model EXIDE Maxxima ## Description ## Marine battery Exide EX900 Maxxima 50Ah 800A 12V 12*V* Voltage 50*Ah* Capacity 800*A* Cold cranking 17.90*kg* Weight The **Exide EX900 marine battery** offers **12 V**, **50 Ah** and **800 A** of cold cranking current (EN) from the **Maxxima** range with AGM technology, designed for motor and sailing boats, both for engine starting and onboard services. Its 260 × 173 × 206 mm make it the exact replacement for the 50 Ah battery fitted as standard to many boats. - Resistant to humidity and salt air. - Sealed: no spills or gases in the locker. - Ready for starting outboard and inboard engines. - AGM: faster recharging and better cycle resistance than a conventional battery. ### What the Exide EX900 is for With 50 Ah, the Exide EX900 covers motor and sailing boats, both for engine starting and onboard services. At the end of the season, charge it fully before winter storage. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 17.90 kg, SAE S 3/8" side Terminal terminals and B7 hold-down. ### Dimensions, polarity and mounting The Exide EX900 is made in the 260 × 173 × 206 mm format and weighs 17.90 kg. It uses a B7 hold-down and SAE S 3/8" side Terminal terminals, the system that anchors and connects it in the vehicle. 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. ### The Exide EX900: Maxxima range and AGM technology Within the Exide catalogue, the **Maxxima** series groups the references designed for this use. The EX900 is the 50 Ah model of that family, with the same performance as its siblings in other sizes. AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### Why choose Exide batteries With more than a century of history, Exide Technologies manufactures automotive, marine, motorcycle and industrial batteries in Europe. Its presence as original equipment on assembly lines vouches for the quality of every reference. All the Exide batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Manufacturer's warranty The Exide EX900 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 As a service battery, avoid routine discharges below 50% to extend its cycle life. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. ### Shipping, delivery and returns Orders placed **before 6:00 pm** with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have **14 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 ### Is the Exide EX900 an AGM battery and what are the benefits of AGM? Yes. The Exide EX900 is AGM (Absorbent Glass Mat): sealed lead-acid, with the electrolyte absorbed in glass fibre. It tolerates heat better and handles more cycles than a conventional battery. ### In what position can it be installed on the boat? Being AGM, it is sealed and does not spill: it can be mounted tilted (never upside down) and copes well with vibration and wave impacts. Secure it firmly and keep the terminals away from water. ### What are the dimensions of the Exide EX900 battery? It measures 260×173×206 mm in length × width × height, with the terminals included in the height. Measure the battery tray before ordering: a one-millimetre difference is enough for the hold-down clamp not to close. ### Exide EX900 or Exide EP450: which one to choose? Same case and same technology as the EX900: an alternative by size, not an official equivalent. Compared with the EX900 it has 50 A of cold cranking less. It costs €141.80 more. If the polarity matches and your equipment had a similar capacity, it works as a replacement; if in doubt, ask us with your model. ### Exide EX900 or Exide EM1000: which one to choose? Same case and same technology as the EX900: an alternative by size, not an official equivalent. Compared with the EX900 it has the same Ah and cranking power. It costs €255.70 more. If the polarity matches and your equipment had a similar capacity, it works as a replacement; if in doubt, ask us with your model. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-11-13*