Battery energy storage systems are an important part of today's energy infrastructure as they help to balance supply and demand. The principle specific function of a battery is to store electrical energy and return it to electricity again. Technology features of the system have such devices as high energy density cells. Advanced battery systems with units to monitor and control operations make it possible to charge and discharge quickly at any time, in this context meant those parts were part of the energy management system. Charging and discharging quickly; these are elements of modern battery energy systems that ensure they can be used anywhere from small residential solar installations to large-scale grid operations. That way, the system is reliable; power supply remains stable and does not need to be interrupted under normal conditions for changes in time or voltage level.”