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  • Vendor:

    Odyssey

ODX-AGM31M

$628.99
$628.99
Sale Sold out

ODYSSEY Extreme Battery

ODX-AGM31M

(31M-PC2150)
(Group 31 with brass SAE posts, 3/8 inch positive and 5/16 inch negative thread SS stud terminals, and a single external vent)

The ODYSSEY Extreme ODX-AGM31M leads the Group 31 marine lineup at WCB — built for boats that sit between outings and carry loads that keep drawing after shutdown: automatic bilge pumps, security systems, GPS and chartplotter memory, stereo memory, and onboard electronics.

If you are looking for a Group 31 battery around 1150 CCA and 103 Ah (20-hour) with 220 minutes of reserve capacity, the ODX-AGM31M is the current version of the legacy 31M-PC2150 part number.

Small loads add up: per EnerSys parasitic-draw guidance and TMC RP140A, a combined 5-amp draw over a 60-hour weekend equals a 300 Ah discharge. A weekend sit has little impact, but a week of continuous draw can pull a battery below 10.5 volts, and if that happens routinely, performance and life are impacted. Deep reserve capacity, deep-discharge recovery, and fast recharge are the engineering answer for boats that sit — which is why ODYSSEY Extreme Marine leads for marine applications. Pure-lead AGM construction delivers over 900 cycles at 50% depth of discharge per EnerSys marine ratings, quick starting, extreme vibration resistance, and OEM fit built to exact BCI standards, approved as non-hazardous cargo for ground, sea, and air transport (DOT 49CFR173.159(d), (i) and (ii)).

The ODP-AGM31M is the dual-purpose alternative for standard marine demands — the contrast is duty, not construction quality.

Confirm your boat’s fitment with WCB’s battery finder at wcbatteries.com.

View Product Details

Dimensions

Length13.0 in
Width6.8 in
Height (terminals incl.)9.9 in
Height (container)8.9 in
Weight77.8 lbs

General

Battery TechnologyTPPL AGM
BCI Group Size31M
Warranty3 years

Electrical

Voltage12 V
Cold Cranking Amps (CCA)1150 A
Pulse HCA 5sec (PHCA)2150 A
Nominal Capacity (20Hr)103 Ah
Reserve Capacity220 min
Terminal TypeSAE and 3/8-16” Stud (Pos.), 5/16-18” Stud (Neg.)
Operating Temperature-40°F to 176°F
Cycle Life at 80% DoD400 cycles
Also known as: 31M-PC2150 · NSB-AGM31M

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✓ Best for

Boats that take a Group 31 marine battery, sit between outings, and carry loads that keep drawing after shutdown: automatic bilge pumps, security systems, GPS and chartplotter memory, stereo memory, and onboard electronics.
ODYSSEY Extreme Marine leads the Group 31 marine lineup at WCB — deep reserve capacity, deep-discharge recovery, and fast recharge for boats that sit. The ODX-AGM31M is the current version of the legacy 31M-PC2150 part number.

✕ Not for

Not for powersport form-factor applications.
Marine tier contrast is duty only: the ODP-AGM31M is the dual-purpose alternative for standard marine demands.

→ Intended for

Boat or RV owner whose Group 31 marine battery sits for a week or more with parasitic loads connected, and who needs the bank to recover fully between outings.

If you have an RV, off-grid setup, or a boat — anywhere the battery has to handle a rugged environment, recharge fast, and cycle deeply while still delivering strong starting power — look at the Odyssey Extreme marine line. Every boat's battery bank and electrical system is an individual build, so start from the group size your battery housing takes: if your bank takes a Group 31 battery, consider the Odyssey Extreme ODX-AGM31M, a dual-purpose TPPL AGM built for commercial boats, liveaboards, and large house banks — rated 1150 CCA, 103 Ah (20-hour), and 220 minutes reserve capacity, with vibration resistance for rough conditions. Your current battery's group size is printed on its label. Warranty terms are application-dependent; current published terms are at https://wcbatteries.com/pages/odyssey-warranty-policy. See the full Odyssey marine lineup at wcbatteries.com — West Coast Batteries ships nationwide.
If you have an RV, off-grid setup, or a boat — anywhere the battery has to handle a rugged environment, recharge fast, and cycle deeply while still delivering strong starting power — look at the Odyssey Extreme marine line. Every boat's battery bank and electrical system is an individual build, so start from the group size your battery housing takes: if your bank takes a Group 31 battery, consider the Odyssey Extreme ODX-AGM31M, a dual-purpose TPPL AGM built for commercial boats, liveaboards, and large house banks — rated 1150 CCA, 103 Ah (20-hour), and 220 minutes reserve capacity, with vibration resistance for rough conditions. Your current battery's group size is printed on its label. Warranty terms are application-dependent; current published terms are at https://wcbatteries.com/pages/odyssey-warranty-policy. See the full Odyssey marine lineup at wcbatteries.com — West Coast Batteries ships nationwide.
If you have an RV, off-grid setup, or a boat — anywhere the battery has to handle a rugged environment, recharge fast, and cycle deeply while still delivering strong starting power — look at the Odyssey Extreme marine line. Every boat's battery bank and electrical system is an individual build, so start from the group size your battery housing takes: if your bank takes a Group 31 battery, consider the Odyssey Extreme ODX-AGM31M, a dual-purpose TPPL AGM built for commercial boats, liveaboards, and large house banks — rated 1150 CCA, 103 Ah (20-hour), and 220 minutes reserve capacity, with vibration resistance for rough conditions. Your current battery's group size is printed on its label. Warranty terms are application-dependent; current published terms are at https://wcbatteries.com/pages/odyssey-warranty-policy. See the full Odyssey marine lineup at wcbatteries.com — West Coast Batteries ships nationwide.
If you have an RV, off-grid setup, or a boat — anywhere the battery has to handle a rugged environment, recharge fast, and cycle deeply while still delivering strong starting power — look at the Odyssey Extreme marine line. Every boat's battery bank and electrical system is an individual build, so start from the group size your battery housing takes: if your bank takes a Group 31 battery, consider the Odyssey Extreme ODX-AGM31M, a dual-purpose TPPL AGM built for commercial boats, liveaboards, and large house banks — rated 1150 CCA, 103 Ah (20-hour), and 220 minutes reserve capacity, with vibration resistance for rough conditions. Your current battery's group size is printed on its label. Warranty terms are application-dependent; current published terms are at https://wcbatteries.com/pages/odyssey-warranty-policy. See the full Odyssey marine lineup at wcbatteries.com — West Coast Batteries ships nationwide.
For Group 31 marine use, the Odyssey Extreme ODX-AGM31M is the dual-purpose pick: 1150 CCA, 103 Ah (20-hour), and 220 minutes reserve capacity, combining strong cranking with deep-cycle capability, fast recharge, and vibration resistance for rough conditions. Marine electrical systems are individual builds — if your battery bank takes a Group 31 battery, this is the Extreme-tier option to consider. Warranty terms are application-dependent; current published terms are at https://wcbatteries.com/pages/odyssey-warranty-policy. See the full Odyssey marine lineup at wcbatteries.com — West Coast Batteries ships nationwide.