Fangrui Product Details This Board Is Based On The Principle Of Adjacent Equalization And Cannot Be Used As A Maintenance Tool. To Connect To The Battery, It Must Be Used With The Lithium Battery Protection Board. The Pressure Difference Generated By Charging And Discharging Triggers The Work Of The Equalization Board To Achieve Energy Fer And Balance. Inductive Energy Fer Balance Board, High Current 1.2a Energy Fer Battery Voltage Balancer, Significantly Balance The Battery Voltage And Improve The Overall Use Efficiency Of The Battery Pack! This Module Is The Adjacent Voltage Difference Equalization,the Adjacent Battery Voltage Difference Reaches More Than 0.1v,the Chip Internal Triggers The Equalization Work, Until The Adjacent Battery Voltage Difference Is Within 0.03v And Stops Working,when It Is Used On The Battery Pack,there Is Adjacent Voltage Difference When Charging And Discharging Triggering The Equalization Work,the Battery Pack Voltage Error Will Also Be Pulled Back To An Value, Reducing Battery Maintena