Dell Alienware M11x R2 (Mid 2010) - Manual (Page 31)

CHAPTER 2: GETTING TO KNOW YOUR LAPTOP
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On AC adapter:
Blue or custom AC-color The battery is fully charged.
Blue or custom AC-color fading into
white or custom battery-color The computer is turned off or on and
the battery is charging.
Blue or custom AC-color fading into
black The computer is in standby mode.
On battery:
Amber or custom battery-color The battery is fully charged.
Amber or custom battery-color fading
into black The computer is in standby mode.
Blinking Amber or custom battery-
color The battery charge is low.
For more details on standby and hibernate mode, see Power Options in the control panel of
your Microsoft Windows operating system.