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. Inductive Working Principle: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 Maintenance Costs. Wiring Definition: B-: The Total Negative Pole Of The Battery Pack (the Negative Pole Of The First Battery) B1: Positive Pole Of The First Battery B2: Positive Pole Of The Second Battery B3: Positive Pole Of The Third Battery B4: Positive Pole Of The Fourth Battery B. . . . . . N+ And So On Te