# Odyssey ODX-AGM31M · Boat battery 103Ah

![Odyssey ODX-AGM31M · Boat battery 103Ah](https://bateriasonline.es/3676-home_default/odyssey-odx-agm31m.jpg)

> Odyssey ODX-AGM31M: 103 Ah boat battery, 330×173×251 mm, positive terminal on the left, TPPL. Compare sizes and equivalents; 14-day returns.

**Category:** [Marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries) → [Odyssey](https://bateriasonline.es/en/odyssey-batteries)

- **Canonical URL**: https://bateriasonline.es/en/odyssey-odx-agm31m
- **Language**: en
- **Brand**: Odyssey
- **Reference**: BOL-ODYSSEY-ODX-AGM31M
- **MPN**: ODX-AGM31M
- **Price**: 581,04 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Odyssey |
| Range | ODX |
| Application | Boats |
| Technology | TPPL |
| Capacity | 103 Ah |
| Length | 330 mm |
| Width | 173 mm |
| Height | 251 mm |
| Weight | 34.1 kg |
| Polarity | Positive terminal on the left |
| Terminal type | M |

## Quick description

The Odyssey ODX-AGM31M is a boat battery with 103 Ah, measuring 330 × 173 × 251 mm, with the positive terminal on the left.

## Description

## Where the Odyssey ODX-AGM31M fits

The Odyssey ODX-AGM31M is a battery for boats: engine starting or on-board service, depending on its design, with resistance to damp and hull vibration. Check whether your boat needs starting, service or a dual-purpose battery before choosing.
The ODX-AGM31M belongs to the Odyssey ODX range. [More Odyssey batteries](https://bateriasonline.es/en/odyssey-batteries)

## TPPL technology in the ODX-AGM31M

The ODX-AGM31M is TPPL: thin plate pure lead AGM. It is the technology behind ODYSSEY, GENESIS and PowerSafe.

## Equivalents and alternatives to the Odyssey ODX-AGM31M

We have no other battery with exactly the dimensions and polarity of the ODX-AGM31M. Browse the rest of our [marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries) to compare close options.

## Part numbers and codes for the Odyssey ODX-AGM31M

The ODX-AGM31M is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | ODX-AGM31M |
|---|---|
| Terminal type | M |
| Not to be confused with | Odyssey ODX-AGM31A (100 Ah), Odyssey ODX-AGM31 (100 Ah), Odyssey ODX-AGM34M (65 Ah) |

## Check this before ordering the Odyssey ODX-AGM31M

- Your current battery should say about 103 Ah; a little more is also fine.
- The ODX-AGM31M has the positive terminal on the left: compare it with your current battery.
- Length, width and height of the ODX-AGM31M: 330 × 173 × 251 mm.

## Frequently asked questions about the Odyssey ODX-AGM31M

### How much does the Odyssey ODX-AGM31M weigh?

34.1 kg, with 103 Ah of capacity.

### Which side is the positive terminal on the Odyssey ODX-AGM31M?

On the ODX-AGM31M, the positive terminal is on the left with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### How do I look after the boat battery in winter?

Leave it 100% charged, disconnected or on a marine maintenance charger. A battery that spends the winter half-discharged loses capacity permanently.

## Other options if you are unsure about the ODX-AGM31M

- [More marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries)
- [Full Odyssey catalogue](https://bateriasonline.es/en/odyssey-batteries)
- [Odyssey ODP-AGM31M](https://bateriasonline.es/en/odyssey-odp-agm31m) · 87 Ah, 328×173×254 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-11*