This is a normal phenomenon, when the phone is plugged into the usb cable to charge, the battery pattern of the phone status bar will have a lightning pattern. It means that the mobile phone is charging normally, if the mobile phone supports the LED indicator function, the mobile phone is in the process of charging, turn off the screen, and the red light will be displayed, and the green light will be on after it is full.
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Generally, the mobile phone indicator is red for the charging state, and green for the charging. Charging is red when the phone's battery is less than 20%, and turns green when it is greater than 20%. But do not know all the model design, so there is another possibility, red and green alternately represents charging. Steady green: Charging is complete.
The mobile phone charging lightning sign turns green to slowly recharge