HP ProBook 6555b Notebook-PC - Manual (Page 81)

● Blinking amber: A battery that is the only available power source has reached a low battery level.
When the battery reaches a critical battery level, the battery light begins blinking rapidly.
● Off: If the computer is plugged into an external power source, the light turns off when all batteries
in the computer are fully charged. If the computer is not plugged into an external power source,
the light stays off until the battery reaches a low battery level.
Maximizing battery discharge time
Battery discharge time varies, depending on the features you use while on battery power. Maximum
discharge time gradually shortens as the battery storage capacity naturally degrades.
Tips for maximizing battery discharge time:
● Lower the brightness on the display.
● Check the Power saver setting in Power Options.
● Remove the battery from the computer when it is not being used or charged.
● Store the battery in a cool, dry location.
Managing low battery levels
The information in this section describes the alerts and system responses set at the factory. Some low-
battery alerts and system responses can be changed using Power Options in Windows Control Panel.
Preferences set using Power Options do not affect lights.
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 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.
Resolving a low battery level
CAUTION: To reduce the risk of losing information when the computer reaches a critical battery level
and has initiated Hibernation, do not restore power until the power lights turn off.
Resolving a low battery level when external power is available
▲ Connect one of the following devices:
● AC adapter
● Optional expansion product or docking device
● Optional power adapter
Using battery power 71