HP EliteBook 8540w Mobile Workstation - Manual (Page 87)

The computer takes the following actions for a critical battery level:
● If Hibernation is enabled and the computer is on or in the Sleep state, the computer initiates
Hibernation.
● If Hibernation is disabled and the computer is on or in the Sleep state, the computer remains briefly
in the Sleep state, and then shuts down and loses any unsaved information.
Using battery power 75