OTR Group Silver Flooded Marine/RV Battery Group 24M 12V 550 CCA. This dual-purpose flooded battery is engineered to deliver starting power and sustained accessory supply for marine and RV fleets. Rated at 550 cold-cranking amps (CCA), it addresses the operational problem of reliable engine starts in cold or high-load conditions while providing a deep-cycle capability to run lights, pumps, refrigerators and other onboard systems when the engine is off. The construction uses flooded-cell design with heavy-duty grids and plates suited to repeated discharge and recharge cycles common in fleet marine and recreational applications. A reserve capacity of approximately 140 minutes supports extended accessory runtime, reducing dependence on vehicle alternators or shore power during overnight or multi-day deployments. Dimensions and form factor conform to Group 24M specifications for straightforward replacement and standardized mounting in many engine and battery compartment layouts. The battery is marketed with vibration-resistant features to withstand the shock and motion typical of road and sea use, minimizing premature failure from mechanical stress. Serviceability and lifecycle economics matter to fleet managers: the dual-purpose design lowers the need for separate starting and deep-cycle batteries, simplifying inventory and reducing the number of SKUs carried for repair and replacement. Installation-ready top terminals and a carry handle facilitate quicker swap-outs at service points or in the field, helping reduce vehicle downtime. For fleets that specify a silver flooded Group 24M battery with a 550 CCA rating and approximate 140-minute reserve capacity, this OTR Group offering presents a standardized power option intended to streamline maintenance, support consistent starting performance, and provide measurable accessory runtime for marine and RV equipment.