A Vanadium Redox Battery is a type of rechargeable battery that uses vanadium ions in different oxidation states to store energy. It is a flow battery, meaning that electrical energy is generated through the movement of a liquid electrolyte between two different tanks, with each tank containing one of the vanadium ions. The battery is capable of discharging a large amount of energy with very little degradation over time, making it a reliable and efficient energy storage system.