# Marine battery Odyssey ODP-AGM31M 87Ah 925A AGM

![Marine battery Odyssey ODP-AGM31M 87Ah 925A AGM](https://baterias.com/1390-home_default/battery-odyssey-odp-agm31m-87ah-925a.jpg)

> Odyssey ODP-AGM31M marine battery 87Ah 925A AGM. ODP range. Dimensions 328×173×254 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-odp-agm31m-87ah-925a
- **Language**: en-GB
- **Brand**: ODYSSEY
- **Reference**: BCOM-ODYSSEY-ODP-AGM31M
- **MPN**: ODP-AGM31M
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | ODYSSEY |
| Reference | ODP-AGM31 M |
| Model | ODP |
| Largo | 328 cm |
| Ancho | 173 cm |
| Alto | 254 cm |
| Peso | 28.7 kg |
| Tecnología | AGM |
| Terminal layout | Positive terminal on the left |
| Terminal type | M |
| Cold cranking amps (EN) | 925 |
| Capacity (C20) | 87 Ah (c20) |
| Capacity (C10) | 81 Ah (c10) |

## Quick description

**Odyssey ODP-AGM31M 87Ah 925A** 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
87 Ah C20

🔋 Cold cranking
925 A SAE

📏 Dimensions
328×173×254 mm

⚙️ Technology
AGM

🧭 Polarity
Positive on the left

⚖️ Weight
28,7 kg

🏷️ Model
ODP

## Description

## Marine battery Odyssey ODP-AGM31M ODP 87Ah 925A

87*Ah* Capacity
925*A* Cold cranking
28.70*kg* Weight

The **Odyssey ODP-AGM31M** with AGM technology is a marine battery with **87 Ah** and **925 A** of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. Measuring 328 × 173 × 254 mm and the positive terminal on the left, it is the direct replacement for boats fitted from the factory with a 87 Ah battery of this format.
- AGM: faster recharging and better cycle resistance than a conventional battery.
- Ready for starting outboard and inboard engines.
- Sealed: no spills or gases in the locker.
- Resistant to humidity and salt air.

### What the Odyssey ODP-AGM31M is for

With 87 Ah, the Odyssey ODP-AGM31M 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 28.70 kg and M terminals.

### Will it fit your current battery tray?

The Odyssey ODP-AGM31M is made in the 328 × 173 × 254 mm format and weighs 28.70 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.

### 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. We guarantee that every Odyssey arrives new, charged and with the manufacturer's full warranty.

### The Odyssey ODP-AGM31M: ODP range and AGM technology

Within the Odyssey catalogue, the **ODP** series groups the references designed for this use. The ODP-AGM31M is the 87 Ah model of that family, with the same performance as its siblings in other sizes.
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.

### 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.

### Manufacturer's warranty

The Odyssey ODP-AGM31M 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

Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.

## Frequently asked questions

### Is the Odyssey ODP-AGM31M an AGM battery and what are the benefits of AGM?

Yes. The ODP-AGM31M 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 fit the ODP-AGM31M 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 our blog. 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 — with positive on the left 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.

### How long does the Odyssey ODP-AGM31M battery last?

Expected lifespan of the Odyssey ODP-AGM31M 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-AGM31M battery?

Dimensions (length × width × height) are 328×173×254 mm — also written as 328x173x254 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.

### What polarity does the Odyssey ODP-AGM31M battery have?

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.

### Is the ODP-AGM31M valid for my vehicle?

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 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The ODP-AGM31M typically fits a wide range of European vehicles thanks to its standard DIN case format.

### What are the equivalents of the ODP-AGM31M model?

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.


## 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

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*baterias.com — Automotive batteries · 2026-10-23*