OTR Group Size 31S Silver Heavy Duty Truck Battery 12V 750 CCA 3/8" Stud. This heavy-duty commercial battery is engineered to address the primary operational problem fleets face: inconsistent starting power and unscheduled downtime due to battery failures in demanding, real-world conditions. Rated at 750 cold cranking amps (CCA) and a reserve capacity of 170 minutes, the battery provides quantifiable starting capability and reserve energy that supports repeated engine starts and short-duration auxiliary loads between charging opportunities. Its flooded, maintenance-free design employs punched calcium/lead alloy grids to deliver enhanced corrosion resistance and stable electrical flow over time, helping preserve starting capacity through heavy use and in colder ambient temperatures. The threaded 3/8" stud terminals provide a secure, serviceable connection that is compatible with standard commercial installation practices and reduces time spent on terminal troubleshooting and retorqueing. By combining industry-standard Group 31S footprint and proven lead-acid construction, this battery fits a wide range of medium- and heavy-duty truck applications where reliable cranking and reserve power are required. For fleet operations, the measurable benefits include consistent cold-start performance at rated CCA, a documented reserve capacity to support limited accessory draw when the engine is off, and a maintenance-free service profile that reduces routine watering tasks. Built with reinforced materials and designed for vibration-prone environments, the battery helps maintain electrical system readiness across route cycles and seasonal temperature swings. This product is intended for commercial users who prioritize dependable starting, predictable reserve energy, and a secure terminal interface to minimize service interruptions and keep vehicles in operation.