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Power-status indicators
1 Sleep (standby in Windows XP) status
• Green: The computer is in sleep (standby) mode.
• Blinking green: The computer is entering sleep (standby) or hibernation mode, or is resuming normal
operation.
2 Battery status
• Green: The battery has more than 20% charge.
• Orange: The battery has between 5% and 20% charge
• Fast blinking orange: The battery has less than 5% charge.
Note: The battery may be charging.
• Slow blinking orange: The battery is being charged. When it reaches 20%, the blinking color changes to
green.
• Slow blinking green: The battery has between 20% and 80% charge, and charging is continuing.
When the battery reaches 80% charge, blinking stops, but the charging may continue until the battery is
100% charged.
Note: If the computer is operating on battery power, the Battery status indicator does not work while the
computer is turned off or is in sleep (standby) mode or hibernation mode.
• Quick blinking orange: An error has been occurred in the battery.
• The battery status indicator is off: The battery of your computer is detached.
Some models of ThinkPad W520 notebooks are shipped with a color sensor.
3 Color sensor status
• Green: Calibration is complete. When the lid is opened, the indicator turns off.
• Blinking green: Display colors are being calibrated.
Chapter 1. Product Overview 15