A pre-assembled, modular energy storage device contained inside a normal shipping container is known as a containerized battery system. . In this rapidly evolving landscape, Battery Energy Storage Systems (BESS) have emerged as a pivotal technology, offering a reliable solution for storing energy and ensuring its availability when needed. This guide will provide in-depth insights into containerized BESS, exploring their components. . The lithium-ion batteries used for energy storage are very similar to those of electric vehicles and the mass production to meet the demand of electric mobility "is making their costs reduce a lot and their application viable to store large volumes of energy, which is known as stationary storage,". . The containerized battery system has become a key component of contemporary energy storage solutions as the need for renewable energy sources increases. This system is essential for grid stability, renewable energy integration, and backup power applications because of its modular design. . rage applications in commercial and industrial environments. The containerized configuration is a single container with a power conversion system, switchgear, racks of batteries, HV C units and all associated fire and safety equipment inside.