When the battery voltage is lower than 3V, it enters the trickle charging mode, charging the battery with a charging current of 100mA.
When the battery voltage is greater than 3V, enter the constant current charging mode, and charge the battery with the set constant current charging current.
When the battery voltage is close to 4.2V and the charging current is less than 300mA, it enters the constant voltage charging mode.When the battery is fully charged, if it detects that the battery voltage is lower than 4.1V, it will start to charge the battery.
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