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System Information Guide 19
USB Charging
You can charge your device battery when the cradle with the device is
connected to a computer by a USB cable, and the computer is plugged into
an electrical outlet and turned on.
NOTE: USB charging will not take place if the device is turned on.
You can charge the battery using a 5V/500mA USB port when the device is
turned off.
NOTE: Using an external USB hub with 5V/100mA ports to charge the device
battery may cause a temporary voltage drop in the hub, and other USB devices
connected to the ports on the hub may not work normally until the device is
removed.
NOTE: Charging the battery through a USB port takes more time than direct AC
adapter charging.
The device charger stops the charging process after 7 hours. If you need
more than 7 hours to charge the device battery, disconnect and reconnect
the USB cable to restart the charging process.