Asus AiGuru S2 - Manual (Page 20)

1-6 Chapter 1: Basic information
1.2.3 Charging the battery
Low battery indicator
The battery indicator (green) on the upper left corner of the screen indicates how
much charge remains in the battery. When the battery indicator shows (red), you
need to recharge the battery. Charge the battery through the USB cable.
USB direct charging
1. Connect the USB Series B plug
(with the squarish end) to the port
at the bottom of the phone.
2. Connect the USB Series A plug
(with the flat rectangular end) to a
USB 2.0 port on your computer.
Make sure your computer
is turned on. For the best
battery performance, make the
battery charge and discharge
completely the first few times
you use it.
For some PC, USB ports may
fail to deliver enough power to
the devices connected to them.
When using S2, connecting
your S2 and the dongle to
neighboring USB ports is not
suggested.
To know the charging status of the phone, note the LED color on the
upper left corner of the handset. Refer to the table below.
Color Indication
Orange (blinking) Battery charging
Green (blinking slowly) Idle mode (backlight is off)
No color (LED off) Phone in use