Lithium Battery Packs need to be Balanced Charged and protected from Over Charge and Over-Discharge. This ensures the safety of the circuit and gives optimum battery life preserving the original capacity through use. You can use this Battery Management System(BMS) to ensure these conditions. It also offers short-circuit protection. If you are using a 4S Lithium Battery in your project, you can also use this BMS Module to protect it from short circuits in the circuit. In the event of a short circuit, the BMS will cut power to the battery and restart. This module provides overcharging, over-discharging, short circuits, and also overcurrent draw protection to the Battery Pack. It also charges the battery in a balanced manner. For any protection condition, the 1S 3A LiFePO4 Lithium Battery recovers automatically after some time after the protection trigger condition is not present. NOTE: Before, attaching the battery pack or making a battery pack, ensure that all the batteries in the battery pack are having the same voltage level, if any of the battery is having different voltage then give it a cycle of charge/discharge and make all batteries at a same voltage level than only attach it with Battery Management System. Features : This protection board is 3s 4s 5s in common use lithium battery protection board. Specified chip, stable performance, support disconnection protection, over-current protection, over-discharge protection, overcharge protection, with balance, etc. A common use for “same port” and “different port”, the protection board uses 15 high-power of ultra-low resistance MOS tubes (discharge of 8, charging 7), in the same port mode can support the discharge current 60A, charging current 60A; different port mode discharge current 80A, charging current 60A. Can use for LMO.Ternary lithium battery.LCO(3.7V)battery packs etc. Specifications: Single-cell battery overload protect voltage: 3.61-3.69V Single-cell battery overload protects voltage recovery: 3.