5V Step-Up Power Module Lithium Battery Charging Protection Board Boost Converter LED Display USB For DIY Charger 134N3P

Product Parameters:
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
Light display:
Charging: red light flashing (red light long brightness means full charged)
Discharge:
Blue light flashing