HP EliteBook 2740p Tablet-PC - Manual (Page 88)

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
Resolving a low battery level when a charged battery is available
1. Turn off the computer or initiate Hibernation.
2. Remove the discharged battery, and then insert a charged battery.
3. Turn on the computer.
Resolving a low battery level when no power source is available
▲ Initiate Hibernation.
– or –
Save your work and shut down the computer.
Resolving a low battery level when the computer cannot exit Hibernation
When the computer lacks sufficient power to exit Hibernation, follow these steps:
1. Insert a charged battery or plug the computer into external power.
2. Exit Hibernation by briefly sliding the power switch to the right.
Calibrating a battery
Calibrate a battery under the following conditions:
● When battery charge displays seem inaccurate
● When you observe a significant change in battery run time
Even if a battery is heavily used, it should not need to be calibrated more than once a month. It is also
not necessary to calibrate a new battery.
Step 1: Fully charge the battery
WARNING! Do not charge the computer battery while you are onboard aircraft.
NOTE: The battery charges whether the computer is off or in use, but it charges faster when the
computer is off.
76 Chapter 6 Power management