A battery storage system is a technology that stores electrical energy for later use. It typically consists of rechargeable batteries that capture energy from sources like solar panels or the electric grid. This stored energy can be used during peak demand times or when renewable energy sources are not producing electricity. These systems help improve energy efficiency and reliability. By storing excess energy, they reduce the need for additional power generation and can lower electricity costs. Battery storage systems are increasingly important in managing energy supply and demand, especially as the use of renewable energy grows.