Welcome to our store! 1. Extra Card: The equalization card is only an auxiliary tool for the BMS protection board, without overvoltage and overdischarge protection functions. Any bad battery tests can be used. Voltage protection can only be achieved when used in parallel with the BMS protection board. 2. Applicable Battery: NCM(Li ion) LFP, general ternary iron lithium battery, LTO battery is not supported. Single voltage range 3.0V to 4.5V; recommended battery capacity under 30AH. 3. Equalization Method: It is detected that the voltage difference between adjacent batteries is greater than 0.1V to trigger equalization start, and the voltage difference is less than 0.03V to stop working. (Multiple charges and discharges are required to achieve a better balanced effect.) 4. Voltage and Current: 30mV (typical value) voltage balance accuracy between adjacent voltages, 0.1V voltage difference 0.5A balance current, when the voltage difference is over 0.2V, the maximum balance current is 1.2A. 0.01mA quiescent current, enters sleep mode when the adjacent voltage difference is less than 0.03V. 5. Please Note: Low string compatibility is not recommended, the indicator light will flash and report an error. Ensure each battery is properly connected and insulated before connecting. Otherwise, it will short circuit and burn the board. Item Type: Battery Active Balancer Material: PCB Operating Voltage: 3.0V to 4.5V Applicable Battery: NCM(li Ion) LFP, General Ternary Iron Lithium Battery 1 x Battery Active Balancer 1 x Cable Customers are our top priority. If you encounter any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.