HP EliteBook 2740p Tablet-PC - Manual (Page 83)

3. Plug the other end of the power cord into an AC outlet (3).
Using battery power
When a charged battery is in the computer and the computer is not plugged into external power, the
computer runs on battery power. When the computer is plugged into external AC power, the
computer runs on AC power.
If the computer contains a charged battery and is running on external AC power supplied through the
AC adapter, the computer switches to battery power if the AC adapter is disconnected from the
computer.
NOTE: The display brightness is decreased to save battery life when you disconnect AC power. To
increase display brightness, use the fn+f10 hotkey or reconnect the AC adapter.
You can keep a battery in the computer or in storage, depending on how you work. Keeping the
battery in the computer whenever the computer is plugged into AC power charges the battery and
also protects your work in case of a power outage. However, a battery in the computer slowly
discharges when the computer is off and unplugged from external power.
WARNING! To reduce potential safety issues, use only the battery provided with the computer, a
replacement battery provided by HP, or a compatible battery purchased from HP.
Computer battery life varies, depending on power management settings, programs running on the
computer, display brightness, external devices connected to the computer, and other factors.
Finding battery information in Help and Support
The Battery information section of the Help and Support Learning Center provides the following tools
and information:
● Battery Check tool to test battery performance
● Information on calibration, power management, and proper care and storage to maximize battery
life
● Information on battery types, specifications, life cycles, and capacity
To access Battery information:
▲ Select Start > Help and Support > Learning centers. Scroll to the battery information once HP
Support Assistant opens.
Using battery power 71