The ODYSSEY Performance ODP-AGM31M is a Group 31 marine dual-purpose Thin Plate Pure Lead (TPPL) AGM battery — solid starting power and house power for boats with standard marine demands.

If you are looking for a Group 31 battery around 925 CCA and 100 Ah (20-hour) with 200 minutes of reserve capacity, the ODP-AGM31M is the current version of the legacy 31M-925 part number.

Parasitic draw is what drains marine batteries between outings: automatic bilge pumps, security systems, GPS and chartplotter memory, stereo memory, and onboard electronics keep drawing after shutdown. 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.

For boats that sit for extended periods between outings or carry always-on electronics, ODYSSEY Extreme Marine leads the Group 31 marine lineup — the ODX-AGM31M brings higher cranking power, deeper reserve, faster recharge, and deeper cycling — while the ODP-AGM31M is the dual-purpose alternative for standard marine demands. The ODP-AGM31M is a marine battery and is not positioned for powersport form-factor applications.

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