Yeeco Fast Charging Module Lithium Battery Charging Board DC 4.5-5.5V to 4.2V 3A High Current DC-DC Buck Power Supply Module

Parameters: Input Voltage: 4.5-5.5V Output Voltage: 4.2V Charging Current: 3A (can be changed by adjusting resistance) Current Regulation: -Default 3A -Remove the resistor---2A -Replace it with 135k resistor---1A Indicator Light: -Red: charging condition -Blue: full charged condition NOTE: this item does not come with power indicator function and battery protection function Complete CC / CV Charging Mode: - When the battery voltage is lower than 3V, enter the trickle charge mode to charge the battery with 100mA. - When the battery voltage is greater than 3V, enter the constant current charging mode to charge the battery with the set constant current. - When the battery voltage is close to 4.2V and the charging current is less than 300mA, enter the constant voltage charging mode.