MULTIPLE PROTECTION The main functions are: over charge protection, over discharge protection, over current protection, short-circuit protection, temperature protection, Downtime protection，Voltage balance(passive balance), etc. OPERATING TEMPERATURE The Lifepo4 battery (3.2V) supports charging and discharging from 2.3V to 3.65V zones, low temperature protection up to -20°C, and high temperature protection up to 70°C. Different voltages, currents. There are different parameter details. NOTICE Before installing the BMS protective board, it is necessary to match the voltage, capacity, and internal resistance (the voltage difference between the battery per section is not higher than 0.05V, the difference between the internal resistance is not more than 5MΩ, and the capacity difference is less than 30mAh). Otherwise the battery pack will not be able to charge. WIRING METHOD Common port wiring methods: B- battery pack negative , C-charging negative/output negative. All the positive electrodes are the total positive pole from the battery pack. EXCELLENT SOLUTION Bisida's BMS is manufactured using excellent protective integrated circuit IC and excellent Mosfet, making it robust, long-lasting and reliable Voltage Value: 38.4V  Charger Voltage: 43.2V  Working Current: 50A  Charging current: Recommended below 5A  Temperature protection: -20 ~ 70 ℃  Applicable Battery: 3.2V Lifepo4 Battery (Single Cell)  Instantaneous CurrenT: 3 to 5 Times the working current.  Package Contents:  Battery Protection Board*1  Cable*1  Please note: Our products use the integrated IC solution. It means that the SOC accuracy of the BMS is very high, and the voltage of each string will be collected. It must be required that the voltage, internal resistance, and capacity must be the same height during assembly, otherwise the BMS will disconnect and protect (disconnection protection function).  This product is an industrial semi-finished product, which needs to be repaired and assembled by people with professional electrical knowledge. Thank you for your understand.