1s 3A 3.7V li-ion BMS PCB protection board for 18650 lithium-ion battery Features of 1S 3A 3.7V Li-ion BMS PCM Battery Protection Board for 18650 Lithium Lion: the high-accuracy voltage detection circuit. the terminal of the charger using a high voltage device; Built-in three-stage over-current detection circuit (over-current 1, over-current 2, load short circuit); MOS transistor can control the battery charge and discharge; Parameter: Overcharge voltage: 4.25±0.05V Overcharge release voltage:4.23±0.05V Over-discharge voltage:2.54±0.1V Maximal continuous charging current: 2A Maximal continuous Discharging current: 2A Over-current protection: 3A Size: L40*W4*T3mm. The main function: Overcharge protection, over-discharge protection, short circuit protection, overcurrent protection. Connection description: B connect to battery B- connect to battery P for battery output input P- for battery output input- Package Included: One Piece of Single Cell lithium battery protection board 3A NO RETURN/EXCHANGE IN BATTERIES AND CELLS