Fuhjythy Type-C USB 5V 2A Boost Converter Step-Up Power Module Lithium Battery Charging Protection Board DIY Charger Easy to Use with Welding

It supports the external key, which is connected to the K point and the output negative pole. Short to turn on the power display and turn on the 5V output. Two consecutive short presses turn off the power display and turn off the 5V output. When the load current is less than 50mA continuously, the output be turned off. When the battery voltage drops below 4.1V, the charging cycle starts again. When the charging current drops to 100mA after reaching the final floating charging voltage, the charging cycle be automatically terminated. When the battery voltage is lower than 2.8V, the battery be pre with a current of 180mA.