# Marine battery Exide EZ850 Dual EFB 12V 100Ah 900A EFB ![Marine battery Exide EZ850 Dual EFB 12V 100Ah 900A EFB](https://baterias.com/5802-home_default/battery-exide-ez850-12v-100ah-850wh-900a.jpg) > Exide EZ850 marine battery 12V 100Ah 900A EFB. Marina & Leisure Dual EFB range. Dimensions 353×175×190 mm, + terminal on the right. 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-ez850-12v-100ah-850wh-900a - **Language**: en-GB - **Brand**: EXIDE - **Reference**: BCOM-EXIDE-EZ850 - **EAN**: 3661024037495 - **MPN**: EZ850 - **Price**: 146,20 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | EXIDE | | Reference | EZ850 | | Model | EXIDE Dual EFB | | Voltage (V) | 12 V | | Largo | 353 mm | | Ancho | 175 mm | | Alto | 190 mm | | Peso | 25.5 kg | | Tecnología | EFB | | EAN | 3661024037495 | | Terminal layout | Positive terminal on the right | | Terminal type | EN taper post | | Hold down | B13 | | Cold cranking amps (EN) | 900 A | | Capacity (C20) | 100 Ah (c20) | | Case type | L05 | | Energy (Wh) | 850 Wh | ## Quick description **Exide EZ850 12V 100Ah 900A** is a marine battery with reinforced anti-vibration case for moorings and offshore use. Tolerates the typical daily cycles on a boat (engine start + night-time services such as lights, sonar, fridge) and holds voltage even when the hull is rolling in open sea. ## 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 100 Ah C20 🔋 Cold cranking 900 A EN-1 📏 Dimensions 353×175×190 mm ⚙️ Technology EFB 🧭 Polarity Positive on the right ⚖️ Weight 25,5 kg 🏷️ Model EXIDE Marina & Leisure Dual EFB ## Description ## Marine battery Exide EZ850 Dual EFB 100Ah 900A 12V 12*V* Voltage 100*Ah* Capacity 900*A* Cold cranking 25.50*kg* Weight With **100 Ah** at **12 V** and **900 A** of cold cranking current (EN), the **Exide EZ850** from the **Dual EFB** range is built for motor and sailing boats, both for engine starting and onboard services. Measuring 353 × 175 × 190 mm and the positive terminal on the right, it is the direct replacement for boats fitted from the factory with a 100 Ah battery of this format. - Sealed: no spills or gases in the locker. - Resistant to humidity and salt air. - EFB: the evolution of the conventional battery for basic Start-Stop cars. - Ready for starting outboard and inboard engines. ### What the Exide EZ850 is for On board, the Exide EZ850 provides 100 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 a weight of 25.50 kg, EN taper post terminals and B13 hold-down. ### Size, terminals and hold-down of the Exide EZ850 In terms of format, the Exide EZ850 measures 353 × 175 × 190 mm (length × width × height) and weighs 25.50 kg. 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. It uses a B13 hold-down and EN taper post 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. ### 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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### The Exide EZ850: Dual EFB range and EFB technology The EZ850 is part of the Exide **Dual EFB** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. EFB combines the robustness of the flooded battery with improved plates and separators. The result is a clearly longer service life in vehicles that start and stop constantly. ### How to make it last longer As a service battery, avoid routine discharges below 50% to extend its cycle life. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections. ### Manufacturer's warranty The Exide EZ850 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 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 EZ850 model EFB? Which boats need it? Yes: the EZ850 (100 Ah) is an EFB, an evolution of the flooded lead-acid battery with additives that strengthen the plates. It withstands more cycles than a conventional battery but fewer than an AGM, and it is fitted to boats with basic Start-Stop, without regenerative braking. It is more affordable than an equivalent AGM. ### Is this a starting or a service (leisure) battery? Dual purpose: it can start the engine and also work as a service battery, handy on boats with a single battery. On boats with two circuits the ideal is one starting battery and one service battery. ### In what position can it be installed on the boat? It must be mounted upright, firmly secured and in a ventilated compartment, because it gives off gases when charging. Keep the terminals away from salt water. ### What are the measurements of the EZ850 model? Measure the battery tray before ordering: a one-millimetre difference is enough for the hold-down clamp not to close. It measures 353×175×190 mm in length × width × height, with the terminals included in the height; that is the European L5 case size. ### Which side is the positive terminal on this battery? Polarity of the Exide EZ850: positive on the right. Seen from the front, terminals towards you, the positive (+) is the post with the red ring. A change of polarity from the original means longer cables or a reconfigured system and can cause a short circuit: check it before ordering. ### Exide EZ850 or Varta LED95: which one to choose? Same case and same technology as the EZ850: an alternative by size, not an official equivalent. Compared with the EZ850 it has 5 Ah less and 50 A of cold cranking less. It costs 17,50 € 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 · 2026-11-08*