The integration of energy storage batteries within microgrids significantly enhances their functionality, reliability, and sustainability. Recognized for their indispensable role in ensuring grid stability and seamless integration with renewable energy sources. This article. . A Battery Energy Storage System is an integrated electro-mechanical and digital system that stores electrical energy in batteries when there is a surplus of energy and delivers it back to the grid or load when required or during peak load periods. It can autonomously disconnect and operate in “island mode” during grid outages, enhancing power reliability.