The battery icon indicates the charging state. While
charging, the charge indicates lightning icon.
2.6 Connect phone with PC
Once phone is connected to PC by USB cable and
the below screen will be showing:
You can only charge now. If you want to exchange/manage
data/pictures between your phone and PC, you can click
the MTP or PTP mode. For other mode, just eject the USB
cable.
Note: If the battery is powerless, the
battery icon will reappear after a few
minutes of charging.