Mini Lithium Battery Charging Board Module 3.7V 4.2V 18650 Lithium Battery Charger Protection Board Type-C Interface The charging current is as high as 600 milliamps. 2.8V trickle charging threshold. Support automatic recharging function and charging current monitoring output for power monitoring. Constant current/constant voltage charging mode with thermal regulation function ensures maximum charging rate while avoiding overheating. Can be applied to small electronic devices such as power banks, Bluetooth earphones, and smartwatches. Charging interface: USB Type-C Input voltage: DC 5V Maximum charging current: 600mA Charging cut-off voltage: 4.2V ± 1% instructions: The Type-C interface is connected to USB power supply. The green light is high and the power red light is low, indicating that the power has been connected. The B+B - end is connected to the battery, and the green light goes out. The power red light remains on, indicating that the battery is charging. After the battery is charged, the green light is high and the power red light is low, indicating that it is fully charged. Color: As Shown Material: PCB Package Contents: 10 * Modules