Features: Module name: 1S 3.7V Li-ion Lithium Battery 18650 Charger for Protection PCB Board Maximum output current: 5A Connection description: P+ For Li-ion Lithium Battery Output +, P- For Li-ion Lithium Battery Output - "S" is the detection pin, some devices need to detect the battery voltage feet "R"3 is the sense resistor chip position, the resistance is required to determine the resistance of the device, so we are here to vent empty. If there is a need for bulk orders, we can paste the detection resistor on request. Applications: 1. Lithium-ion battery 2. Lithium-polymer battery Specifications: Diameter: 1.6cm/0.63" Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Includes: 1 x PCB for Protection Board 1 x Plastic Base 1 x Heat Shrinkable Tube