Latitude 5540 Owner's Manual

Battery-charge status light

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.