Flow batteries are a type of rechargeable battery that store energy in liquid electrolytes. These electrolytes are contained in separate tanks, allowing for easy scaling of energy storage capacity. When energy is needed, the electrolytes are pumped through a cell where a chemical reaction generates electricity. One of the main advantages of flow batteries is their long cycle life and ability to discharge energy over extended periods. They are particularly useful for large-scale energy storage applications, such as integrating renewable energy sources like solar power and wind energy into the grid.