The uptake of utility-scale battery storage has grown significantly in recent years as more countries switch to renewables. Battery storage ensures that grids powered by less reliable energy sources, such as wind and solar power, can continue to deliver a stable supply of clean energy through the day and night. The battery storage boom of recent years has been driven largely by the falling costs of lithium-ion batteries, which have made it possible for utilities worldwide to invest in more batteries. The cost of batteries has fallen by around…