# Marine battery Odyssey ODP-AGM27M 79Ah AGM ![Marine battery Odyssey ODP-AGM27M 79Ah AGM](https://baterias.com/1385-home_default/battery-odyssey-odp-agm27m-85ah-850a.jpg) > Odyssey ODP-AGM27M marine battery 79Ah AGM. Vibration resistant, deep-discharge capable; cranking and house duties. 24 h delivery. **Category:** [Boat Batteries](https://baterias.com/gb/boat-batteries) → [ODYSSEY](https://baterias.com/gb/odyssey) - **Canonical URL**: https://baterias.com/gb/battery-odyssey-odp-agm27m-85ah-850a - **Language**: en-GB - **Brand**: ODYSSEY - **Reference**: BCOM-ODYSSEY-ODP-AGM27M - **MPN**: ODP-AGM27M - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | ODYSSEY | | Reference | ODP-AGM27 M | | Model | ODP | | Largo | 318 cm | | Ancho | 173 cm | | Alto | 224 cm | | Peso | 27.1 kg | | Tecnología | AGM | | Scheme | Positive terminal on the left | | Terminal | M | | Arranque en frío CCA EN | 850 A | | Capacidad C20 (Ah) | 85 Ah (c20) | | Capacidad C10 (Ah) | 79 Ah (c10) | ## Quick description **Odyssey ODP-AGM27M 79Ah 850A** 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 ⚡ Capacity 79 Ah C20 🔋 Cold cranking 850 A EN-1 📏 Dimensions 318×173×224 mm ⚙️ Technology AGM 🧭 Polarity Positive on the left ⚖️ Weight 27,1 kg 🏷️ Model Odp ## Description ## Battery Odyssey ELT-AGM27M ODP-AGM27M 85Ah 850A The Battery ODYSSEY ODP-AGM27M ELT-AGM27M 85Ah 850A (sae) ODP belongs to the Odyssey ODP battery range, The Odyssey Performance range batteries have been designed and developed specifically for automotive applications and dimensions, easily handling the growing demands of Start-Stop systems and accessories on board, supplying twice as much power and three times the useful life of theconventional batteries The Odyssey Performance series combines a long shelf life, high reliability and deep cycle capabilities.Odyssey batteries provide the enormous starting power, rapid recovery and incredible deep cycle capacity demanded by current vehicles. They provide all the reliability of Odysser Extreme Series batteries, without their high cold start intensity or their reserve capacity. ### Ideal for: - Start-Stop vehicles - Vehicles with great energy demands ### Battery advantages and characteristics ODYSSEY ODP-AGM27M ELT-AGM27M 85Ah 850A (sae) - Great starting power - Tolerance at extreme temperatures - Greater shelf life - Vibrations resistant ### How to find the right battery for your vehicle or device? If you have doubts about the battery you need, do not hesitate to contact our customer service. ### Why choose an Odyssey battery? The Odyssey brand batteries are resistant to vibrations because they have extreme protection against impacts and vibrations.All this to meet the needs of vehicles, vessels and modern equipment. ### Know more about Odyssey Odyssey, with +25 years in the sector (also developed by Enersys) offers batteries designed with PURE Power TPPL technology, with twice as much power and triple useful life than other conventional batteries. The Odyssey brand batteries have a massive starting power (start -up impulses of up to 2700 amps for five seconds).They are resistant to vibrations because they have extreme protection against impacts and vibrations. All this to meet the needs of modern vehicles, vessels and equipment, since its ODP (performance) and ODX (Extreme) series offer mixed use batteries that are worth almost for any application. If you want additional information about Battery Odyssey ELT-AGM27M ODP-AGM27M, you can download the product's technical sheet at the following link: [ Download technical sheet Odyssey ELT-AGM27M ODP-AGM27M 85Ah 850A](/fichastecnicas/data-sheet-battery-odyssey-odp-agm27m-85ah-850a-en.pdf) ## Frequently asked questions ### Is the Odyssey ODP-AGM27M an AGM battery and what are the benefits of AGM? Yes. The ODP-AGM27M 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. ### How do I check that the Odyssey ODP-AGM27M battery fits my vehicle? Three ways: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team for the ODP-AGM27M; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 9:00–18:00 CET). ### How do I fit the ODP-AGM27M model in my boat? In most boats 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 (−) 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 — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On boats with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### What warranty does the Odyssey ODP-AGM27M battery have? This battery includes 2 years of official manufacturer warranty against manufacturing defects. It applies to defects such as damaged cells, internal short-circuits or abnormal capacity loss. It does NOT cover misuse (prolonged overcharging, inadequate charger, defective alternator). If the battery fails, we replace it at no cost after a technical inspection. ### How long does Odyssey ODP-AGM27M delivery take? In mainland Spain and Portugal it arrives in 24 h if you order before 17:00 and the battery is in stock — it leaves the same day and arrives the next business day. Afternoon or weekend orders ship the next business day. For Balearics, Canaries and other EU destinations, allow 2-5 days. Shipping cost is calculated in the cart based on destination and service (standard, express, cash on delivery). Tracking number is sent by email + SMS as soon as the parcel ships. ### Are returns accepted on this battery? Yes. You have 14 days from delivery to return it. In mainland Spain and Portugal returns are FREE — we cover the return shipping cost via prepaid label. In other EU countries the return shipping cost is the customer's. It must arrive in its original packaging with no signs of installation. If it was defective, the warranty covers replacement even after the 14-day period. ### Where do I find the ODP-AGM27M model online? At baterias.com — authorised distributor with real stock, 24h delivery in mainland Spain and Portugal if you order before 17:00, and full manufacturer warranty. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). Secure payment by card, Bizum, PayPal or bank transfer. If you choose at-home installation, our technician will take the used battery and dispose of it through an authorised collection point. ### How long does the Odyssey ODP-AGM27M battery last? Expected lifespan of the Odyssey ODP-AGM27M is 5 to 8 years in mild-climate boat use with Start-Stop. 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 dimensions of the Odyssey ODP-AGM27M battery? Dimensions (length × width × height) are 318×173×224 mm — also written as 318x173x224 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. ### How much does the Odyssey ODP-AGM27M battery weigh? It weighs 27,1 kg. Most of the weight is lead. If you plan to fit it yourself, use gloves and a carrying strap (AGM batteries are slightly heavier than conventional due to the absorbent glass-mat fibre). ### How many amps does the Odyssey ODP-AGM27M battery have? Nominal capacity 85 Ah[?cca: and [cold-cranking amps 850 A]]. Ah measure the total energy available (autonomy); CCA (also written A in cold or EN under the European standard) measure the instantaneous power to crank the starter motor. A battery with more CCA starts better in winter; one with more Ah keeps accessories on for longer. ### Does this battery fit my boat? Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 9:00–18:00 CET). The ODP-AGM27M typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Odyssey ODP-AGM27M? 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 — an EFB cannot be replaced with a conventional battery in Start-Stop boats. See the "Equivalents" section to view recommended options at the same performance level. ### Which is better: Odyssey ODP-AGM27M or an alternative from another brand? This battery and its equivalents from Bosch, Tudor or Exide are technically comparable: same dimensions, same voltage and same capacity. The differences are warranty (Varta and Bosch: 2 years; Tudor and Exide: 2 years on the equivalent line), manufacturing plant (Varta and Bosch share origin in the Clarios Group; Tudor and Exide belong to Exide Technologies) and price. For private use any of these brands will give 4-6 years of life. Compare them in the "Equivalents" section. ### What real-world experiences are there with this battery? The product rating, when available, is shown on the product page next to the stars. You can also check our public Trustpilot profile at shop level (4.4/5 from 10,783+ verified reviews). Most-praised points: reliable cold start, lifespan above 5 years and fast delivery; most common complaints mention BMS-equipped boats that need OBD registration after fitting. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-07-20*