Description: The Main Function: Overcharge protection, Over discharge protection, Short circuit protection, Overcurrent protection. Using protection IC,High quality MOSFETs such as VISHAY, AOS, IR, etc. FR-4 low temperature coefficient plate.With fine designed and workmanship, comprehensive testing. Compact size,suitable for many occasions requiring high integration and low cost.Meet a variety of performance requirements to ensure the safety and reliability of the battery pack. Application for 3.7V lithium batteries of various capacities and shapes. Specification: Product: 3.7V Lithium Battery PCB Protection Board Color: Green Material: PC Overcharge Detection Voltage: 4.25±0.05V Overcharge Release Voltage: 4.23±0.05V Over Discharge Detection Voltage: 2.45±0.1V Upper Limit Continuous Current: 4A Overcurrent Detection Current: 5A Charging Voltage: 4.2V Product Size: 30x4x2mm/1.18x0.16x0.08inch IC components: DW01+8205A x 2 Wiring instructions: B +: Connected to the battery positive. B-: Connected battery negative. P +: For the battery pack output input positive P-: For the battery pack output input negative Package Includes: 10 Pcs 3.7V Lithium Battery PCB Protection Board(4 Pack) Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is ±1-3cm.