Dell XPS 18 User Manual page 14

You can check the charge/power status of your computer by checking
the light on the side of your computer or the icon on the screen when
your computer is turned on:
Battery-charge indicator located on the right side of your computer:
Power state
S0/S1 (ON)
S3 (Sleep)
S4/S5
(Hibernate or OFF)
Low battery
Battery icon displayed on the screen:
Battery icon
NOTE: You can check exact battery charge level by booting to the
operating system.
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14
Setting Up Your Computer
Power adapter
Battery with no
and battery fully
power adapter
charged
Solid white Solid white
Slow blinking Slow blinking
white white
OFF OFF
Fast blinking Fast blinking
amber amber
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
Power adapter
and battery is
charging
Solid amber
Slow blinking
amber
Solid amber
Fast blinking
amber