The ODYSSEY Extreme ODX-AGM34M leads the Group 34 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 34 battery around 850 CCA and 68 Ah (20-hour) with 135 minutes of reserve capacity, the ODX-AGM34M is the current version of the legacy 34M-PC1500 or NSB-AGM34M 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-AGM34M is the dual-purpose alternative for standard marine demands — the contrast is duty, not construction quality. This battery model comes with the separate spacer for Group 34 batteries.

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