Features: 1) high-accuracy voltage detection circuit; 2) terminal of the charger using high voltage device; 3) Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit); 4) MOS transistor can control the battery charge and discharge; 5) low standby current consumption 4 series 18650 battery 16.8V 16V 14.8V 14.8V (Li-ion 18650 or li-ion battery rated voltage) 16.8V (Li-ion battery full charge voltage) 14.4V ( Lipo battery pack rated voltage) Applications: 4S Li-ion18650,LiCoO2,LiMn2O4,Li(NiCoMn)O2 rechargeable batteries 4S Lipo rechargeable batteries BMS solder instruction: B+ connected battery positive; B1 the connect point between battery 1 and battery 2 B2 connect the point between battery2 and battery 3  B3 Connect the point between battery 3 and battery 4 B- connect to battery negative end  P- + connection charge / discharge positive; P- connection charge / discharge negative Note: 1) this board is not suit high power electronic tools, if use for screwdrier and drill, please don't buy 2)Above 3A device,means the battry discharge rate is more than 3C. 1C rated battery, 2000mah equals 2ah*1=2A max working current. 3C rated battery means 2ahx3=6A Max working current. 4S LI-ION BMS Specifications: Over Charge Voltage:4.25-4.35v±0.05v Over Discharge Voltage: 2.3-3.0v±0.05v Max working current:10A  Max Peak current:20A  Working Temperature:-40~+50  Storage Temperature:-40~+80 Small current: 6uA  Life cycle:50000hours Resistance:45mΩ  Short cut Protection:Protectable ,change for repair  Size: 3.6x3.5cm/1.42x1.38inch Quantity: 1 Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!! Package includes:1 x Protection PCB Board
On 03-Sep-21 at 02:45:47 EDT, seller added the following information: