Dell XPS 17 (L702X, Early 2011) - Manual (Page 31)

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Using Your XPS Laptop
8
eSATA/USB combo connector with USB PowerShare — Connects to eSATA
compatible storage devices (such as external hard drives or optical drives) or USB devices
(such as a mouse, keyboard, printer, external drive, or MP3 player). The USB PowerShare
feature allows you to charge USB devices when the computer is powered on/off or in
sleep state.
NOTE: Certain USB devices may not charge when the computer is powered off or in sleep
state. In such cases, turn on the computer to charge the device.
NOTE:
If you turn off your computer while charging a USB device, the device stops
charging. To continue charging, disconnect the USB device and connect it again.
NOTE: The USB PowerShare feature is automatically shut off when only 10% of the total
battery life remains.