How work
The device uses a constant current / contant voltage algorithm with a preconditioning and end of charging detection
Also limit the charging current according chips temperature, this thermal regulation optimize the charging cycle.
Configured for 450mA of charging current and 4.20v for end of charging.
Have 2 leds, a blue led show when the system is powered from supply ( many times bad called charger). The another led (Red) show when the circuit is charging.