The ODYSSEY Extreme ODX-AGM34/78 is a BCI Group 34/78 Thin Plate Pure Lead (TPPL) AGM battery for working vehicles whose loads never fully shut off: emergency vehicles, work trucks with liftgates, winches, or plows, and fleets running telematics, security camera systems, utility lamps, 12V power receptacles, CPAP circuits in sleeper cabs, and refrigerators or coolers that keep drawing after shutdown.

If you are looking for a Group 34/78 battery around 850 CCA and 68 Ah (20-hour) with 135 minutes of reserve capacity, the ODX-AGM34/78 is the current version of the legacy 34/78-PC1500 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. The ODX-AGM34/78 is built for exactly that duty: the highest cranking output in the WCB Group 34/78 lineup, deep-discharge recovery, extreme vibration resistance, fast recharge, and up to 400 cycles at 80% depth of discharge per EnerSys published ratings.

Group 34/78 is an ODX-only group: the ODX-AGM34/78 is one battery with dual terminals — SAE top posts plus threaded side receptacles — and the slash is part of the product name, not a choice between two batteries. For emergency vehicles, mission-critical uptime, and vehicles that cannot afford a no-start, ODYSSEY Extreme is the floor — for daily drivers with stock electrical loads, a standard-duty battery covers the application. The ODX-AGM34/78 is an automotive and commercial battery and is not positioned for powersport applications.

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