Dell XPS 18 User Manual page 12

Battery-status light:
You can check the charge/power status of your computer by
checking the battery-status light on the side of your computer or the
icon on the screen when your computer is turned on.
Solid white light
Solid amber light
Off
Battery icon displayed on the screen:
Battery icon
NOTE: You can check exact battery charge by hovering the mouse
pointer over the battery icon.
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12
Setting Up Your Computer
Power adapter is connected to the computer
and the battery is being charged.
Battery charge is low or critical.
Power adapter is connected to the computer
and battery is fully charged or power adapter is
not connected to the computer.
Description
Battery is fully charged
Battery is charging
Computer is running on battery power and the
battery is discharging.
Computer is plugged in, and either no battery is
detected, or the battery isn't working correctly.
Battery is low
Battery is critically low