Odyssey ODX-AGM31M · Marine battery 103Ah 1150A AGM
Specifications
| Brand | ODYSSEY |
|---|---|
| Part number | ODX-AGM31M |
| Capacity (C20) | 103Ah (c20) |
| Capacity (C10) | 98Ah (c10) |
| Cold cranking amps (EN) | 1150 |
| Technology | AGM |
| Length | 330 mm |
| Width | 173 mm |
| Height | 251 mm |
Odyssey ODX-AGM31M 103Ah 1150A 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 designbuilt for boat swell and vibration
- Dual functionstarts the engine and powers onboard services
- Sealed and safemaintenance-free even when the boat rolls
Where it fits: the Odyssey ODX-AGM31M is one of our boat batteries and belongs to our Odyssey batteries.

Marine battery Odyssey ODX-AGM31M ODX 103Ah 1,150A
With 103 Ah at V and 1,150 A of cold cranking current (EN), the Odyssey ODX-AGM31M from the ODX range is built for motor and sailing boats, both for engine starting and onboard services. It replaces the original battery without adaptation in boats with a 330 × 173 × 251 mm format: same 103 Ah capacity and the positive terminal on the left.
- AGM technology: absorbed electrolyte, no spills, can be mounted at an angle.
- Reinforced case against vibration and swell.
- Powers onboard services: lights, sounder, GPS, fridge.
- Tolerates the daily cycling of a boat in season.
Size, terminals and hold-down of the Odyssey ODX-AGM31M
In terms of format, the Odyssey ODX-AGM31M measures 330 × 173 × 251 mm (length × width × height) and weighs 34.10 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. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.
What the Odyssey ODX-AGM31M is for
The Odyssey ODX-AGM31M 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 34.10 kg and M terminals.
The Odyssey ODX-AGM31M: ODX range and AGM technology
The ODX is the Odyssey range the ODX-AGM31M belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle.
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.
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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.
Official warranty
The Odyssey ODX-AGM31M comes with the manufacturer's official warranty against manufacturing defects. Deep discharge from winter lay-up without charging is not covered.
Care and maintenance
At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators.
Delivery times 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.
Data sheet
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BrandODYSSEY
-
ReferenceODX-AGM31M
-
ModelODX
-
Length330 mm
-
Width173 mm
-
Height251 mm
-
Weight34.10 Kgs
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TechnologyAGM
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Terminal layoutPositive terminal on the left
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Terminal typeM
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Cold cranking amps (EN)1150
-
Capacity (C20)103Ah (c20)
-
Capacity (C10)98Ah (c10)
Specific References
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UPC635241140675
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MPNODX-AGM31M
Recommended accessories
Frequently asked questions
Is this battery AGM? What is it for?
Yes: the ODX-AGM31M from Odyssey uses AGM (Absorbent Glass Mat) technology, a sealed lead-acid battery whose electrolyte soaks a glass-fibre mat. Its advantages: more charge/discharge cycles than a conventional battery and better heat tolerance.
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-AGM31M battery?
Before buying, measure the space in your boat: one extra millimetre can stop the hold-down clamp from closing. The Odyssey ODX-AGM31M takes up 330×173×251 mm (length, width and height, terminals included).
On which side is the positive of the ODX-AGM31M model?
It has the positive on the left (polarity). Put it in front of you, terminals towards you: the post with the red ring and the + sign is the positive. Compare it with the battery you are replacing: if it does not match, cables must be lengthened or the system reconfigured, with a risk of short circuit.
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