Power Bank Charger 5V 1A Module Charging Circuit Board Step Up Boost Power Module Lithium Battery DIY 134N3P

1.Input Voltage:  3.7V~5.5V
2.Charging Current:  1A(max)
3.Output Current:  1A(max)
4.Output voltage:  5V  
5.BAT Discharging Stop Voltage:  2.9V  
6.Discharging Efficiency:  85%(input 3.7V output 5V/1A)

Features:

1.Charging and discharging indication
2.Internally installed charging and discharging power MOS  
3.Preset 4.2V charging voltage, precision ±1%
4.Max 8uA standby current
5.Integration charging management and discharging management
6.Intelligent temperature control and overtemperature protection
7.Integration output overvoltage protection,short coircuit protection,overload protection
8.Integration overcharging and overdischarging protection
9.Support trickle mode and zero voltage charging

When charging :red light flashing;
Full charged :red light light for a long time.