DC 5V 2.1A ChargeDischargeBoostBattery ProtectionIndication Module 3.7V 4.2V Lithium Batter

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• 4 in 1 ChargeDischargerLithium Battery ProtectionBattery Indicator Module Specification: Charge voltage: DC 4.5V5.2V (recommend DC 5V) Charging current: 02.1A Charge quiescent current: 100uA Full charge voltage: 4.2V + 1percent Discharge current: 03.5A Discharge quiescent current: 50uA Discharge conversion efficiency: Max 96percent Output voltage: 5V Output current: 02.1A Operating temperature: 20~85 celsius Size: 26.7*18.1*5.7mm Weight: 1.9g Comes with battery protection functions, do not need battery protection board: Overcurrent protection(OCP) Overvoltage protection(OVP) Short circuit protection(SCP) Over temperature protection(OTP) Pin description: VIN: Charging port + GND: Charging port BAT: Battery port + GND: Battery port GND: Output port VOUT: Output port + KEY: Output trigger port(Low pulse trigger) How to use: 1. In discharge mode(In the charging mode, the KEY function is invalid), trigger the KEY once turn on the output; Continuously trigger KEY twice turn off the output. 2. When connecting the load for the first time, it will automatically turn on the output. If the load is less than 50mA, the output will be turned off after 30 seconds; If the load is more than 50mA, it will continuously turn on the output.