HP EliteBook 2540p Notebook PC - Manual (Page 72)

Identifying low battery levels
When a battery that is the sole power source for the computer reaches a low battery level, the battery
light blinks.
If a low battery level is not resolved, the computer enters a critical battery level, and the battery light
blinks rapidly.
The computer takes the following actions for a critical battery level:
● If Hibernation is enabled and the computer is on or in Standby, the computer initiates Hibernation.
● If Hibernation is disabled and the computer is on or in Standby, the computer remains briefly in
Standby, and then shuts down and loses any unsaved information.
60 Chapter 5 Power management