The following table lists the battery-charge status light of your
Latitude 5540.
Table 1. Battery charge and status light behaviorBattery-charge status light
Power source
LED behavior
System power state
Battery charge level
AC adapter
Off
S0 or S5
Fully charged
AC adapter
Solid white
S0 or S5
< Fully charged
Battery
Off
S0 or S5
11-100%
Battery
Solid amber (590+/-3 nm)
S0 or S5
< 10%
S0 (ON): Computer is turned on.
S4 (Hibernate): The computer consumes the least power in the Hibernate state than in the ON or OFF state. The computer is almost in the OFF state. The context data is written to a storage device, allowing you to resume from where you left when the computer is turned on.
S5 (OFF): The computer is in a shutdown state.
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