Battery Storage Systems are technologies that store electrical energy for later use. They are commonly used to balance supply and demand in power grids, allowing excess energy generated from sources like solar panels or wind turbines to be saved for times when production is low or demand is high. These systems can vary in size, from small units for residential use to large installations for commercial or utility-scale applications. By providing backup power and enhancing energy efficiency, battery storage systems play a crucial role in promoting the use of renewable energy and reducing reliance on fossil fuels.