This VEVOR dual-purpose LiFePO4 battery combines high cranking power for engine starting with deep-cycle energy storage for accessories and onboard electronics. It delivers 1000 CCA and 140Ah capacity, with a built-in smart BMS that helps protect against overcharge, over-discharge, overcurrent, and temperature extremes. Bluetooth connectivity enables real-time monitoring and control through a compatible app, and an ERM reserve feature helps keep enough power in reserve for reliable starting. The rugged, corrosion-resistant housing is rated IP67 for enhanced durability in marine and outdoor environments.