Identifying low battery levels
When a battery that is the sole power source for the computer reaches a low or critical battery level, the following behavior occurs:
●The battery light (select models only) indicates a low or critical battery level.
– or –
●The power meter icon in the notification area shows a low or critical battery notification.
NOTE: For additional information about the power meter, see Using the power meter and power settings on page 50.
If 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
Resolving a low battery level when external power is available
▲Connect one of the following devices:
●AC adapter
●Optional docking or expansion device
●Optional power adapter purchased as an accessory from HP
Resolving a low battery level when no power source is available
To resolve a low battery level when no power source is available, save your work and shut down the computer.
Conserving battery power
●From the Start screen, type power, select Settings, and then select Power Options.
●Select low
●Turn off wireless and LAN connections and exit modem applications when you are not using them.
●Disconnect unused external devices that are not plugged into an external power source.
●Stop, disable, or remove any external memory cards that you are not using.
●Decrease screen brightness.
●Before you leave your work, initiate Sleep, or shut down the computer.
Using external AC power
WARNING! Do not charge the computer battery while you are onboard aircraft.
WARNING! To reduce potential safety issues, use only the AC adapter provided with the computer, a replacement AC adapter provided by HP, or a compatible AC adapter purchased from HP.
NOTE: For information on connecting to AC power, see the Setup Instructions poster provided in 
the computer box.
External AC power is supplied through an approved AC adapter or an optional docking or expansion device.
Setting power options 53