# Marine battery Odyssey ODX-AGM34M 65Ah 880A AGM ![Marine battery Odyssey ODX-AGM34M 65Ah 880A AGM](https://baterias.com/1419-home_default/battery-odyssey-odx-agm34m-65ah-880a.jpg) > Odyssey ODX-AGM34M marine battery 65Ah 880A AGM. ODX range. Dimensions 277×173×198 mm, + terminal on the left. Cranking and house duties. **Category:** [Boat Batteries](https://baterias.com/gb/boat-batteries) → [ODYSSEY](https://baterias.com/gb/odyssey) - **Canonical URL**: https://baterias.com/gb/battery-odyssey-odx-agm34m-65ah-880a - **Language**: en-GB - **Brand**: ODYSSEY - **Reference**: BCOM-ODYSSEY-ODX-AGM34M - **MPN**: ODX-AGM34M - **Price**: 578,80 € (VAT incl., Spain) - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | ODYSSEY | | Reference | ODX-AGM34 M | | Model | ODX | | Largo | 277 cm | | Ancho | 173 cm | | Alto | 198 cm | | Peso | 23.1 kg | | Tecnología | AGM | | Terminal layout | Positive terminal on the left | | Terminal type | M | | Cold cranking amps (EN) | 880 | | Capacity (C20) | 65 Ah (c20) | | Capacity (C10) | 61 Ah (c10) | ## Quick description **Odyssey ODX-AGM34M 65Ah 880A** 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 ⚡ Capacity 65 Ah C20 🔋 Cold cranking 880 A SAE 📏 Dimensions 277×173×198 mm ⚙️ Technology AGM 🧭 Polarity Positive on the left ⚖️ Weight 23,1 kg 🏷️ Model ODX ## Description ## Marine battery Odyssey ODX-AGM34M ODX 65Ah 880A 65*Ah* Capacity 880*A* Cold cranking 23.10*kg* Weight With **65 Ah** at **V** and **880 A** of cold cranking current (EN), the **Odyssey ODX-AGM34M** from the **ODX** range is built for motor and sailing boats, both for engine starting and onboard services. It measures 277 × 173 × 198 mm and the positive terminal on the left, the format sought by anyone replacing a 65 Ah battery in boats. - Reinforced case against vibration and swell. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Tolerates the daily cycling of a boat in season. - Powers onboard services: lights, sounder, GPS, fridge. ### What the Odyssey ODX-AGM34M is for The Odyssey ODX-AGM34M 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 a weight of 23.10 kg and M terminals. ### Dimensions, polarity and mounting In terms of format, the Odyssey ODX-AGM34M measures 277 × 173 × 198 mm (length × width × height) and weighs 23.10 kg. 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 M 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 Odyssey ODX-AGM34M: ODX range and AGM technology Within the Odyssey catalogue, the **ODX** series groups the references designed for this use. The ODX-AGM34M is the 65 Ah model of that family, with the same performance as its siblings in other sizes. AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly. ### Why choose Odyssey batteries Odyssey batteries combine starting and deep cycling in a single sealed pure-lead unit, with some of the longest warranties on the market. All the Odyssey batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Warranty and coverage The Odyssey ODX-AGM34M comes with the **manufacturer's official warranty** against manufacturing defects. Deep discharge from winter lay-up without charging is not covered. ### Usage and maintenance tips 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. ### 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 ODX-AGM34M model AGM? What does this technology offer? Yes. The ODX-AGM34M from Odyssey uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for boats with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### 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 Odyssey ODX-AGM34M battery? Dimensions (length × width × height) are 277×173×198 mm — also written as 277x173x198 mm — following the European DIN standard. Always measure the space in your boat before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### On which side is the positive of the ODX-AGM34M model? Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ## 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 · 2026-10-30*