It is far more than just batteries in a box; it is a sophisticated, pre-engineered system that includes battery modules, a Battery Management System (BMS), a Power Conversion System (PCS), an Energy Management System (EMS), and crucial thermal management and fire safety equipment. . What are containerized BESS? Containerized Battery Energy Storage Systems (BESS) are essentially large batteries housed within storage containers. These systems are designed to store energy from renewable sources or the grid and release it when required. Q7: What is the environmental impact of us orage,and distribution of electric. . BESS containers are more than just energy storage solutions, they are integral components for efficient, reliable, and sustainable energy management.