This 5V Boost Step-Up Power Module & Lithium Battery Charging Protection Board is a smart step-up and lithium battery charger that has
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 lights for a long time.