A battery balancer, also known as a battery equalizer, is an electronic protective device designed to prevent the decrease in the lifespan of a battery due to imbalances in voltage among individual cells within the battery. When there is an imbalance in voltage between the cells, different cells charge and discharge at different rates. While one cell completes its charging cycle, other cells may be in a state of overcharging or undercharging, both of which can damage the battery and result in reduced capacity and shortened lifespan. The battery balancer ensures real-time balance of energy among individual cells, thereby extending the lifespan of the battery by 5-30%.In this article, ATO industrial automation delves into the components, working principle, advantages, and diverse applications of battery balancers, shedding light on their significance in various industries.