Delta's lithium battery energy storage system (BESS) is a complete system design with features like high energy density, battery management, multi-level safety protection, an outdoor cabinet with a modular design. Furthermore, it meets international standards used in Europe . of reliable, flexible, and cost-effective Battery Energy Storage Systems (BESS). This report provides a comprehensive assessment of BESS technologies, costs, applications, safety considerations, and business models, longside tailored recommendations for Thailand's regulatory and system context. In partnership with local collaborator TCE, this milestone marks a significant step. Inside BESS are battery cells, power converter, power control and management system, and various security systems to provide the most stable energy reserve.