A high capacity energy storage battery is built with the purpose of storing enormous amounts of electrical energy, which typically ranges to several megawatt-hour (MWh). These batteries are used in utility scale energy systems, large scale wind or solar farms and even in industrial type of work. They help with the integration of intermittent stored renewable energy into the grid and make sure power supply is uninterrupted. High capacity energy storage batteries makes use of flow battery also and advanced lithium-ion technology which provides with best energy density, long term durability, and excellent However, their charging and discharging processes are efficient