Using external AC power

External AC power is supplied through one of the following devices:

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.

●Approved AC adapter

●Optional expansion product

Connect the computer to external AC power under any of the following conditions:

WARNING! Do not charge the computer battery while you are onboard aircraft.

●When you are charging or calibrating a battery

●When you are installing or modifying system software

●When you are writing information to a CD or DVD

When you connect the computer to external AC power, the following events occur:

●The battery begins to charge.

●If the computer is turned on, the battery meter icon in the notification area changes appearance. When you disconnect external AC power, the following events occur:

●The computer switches to battery power.

●The display brightness is automatically decreased to save battery life. To increase display brightness, press f3 or reconnect the AC adapter.

50 Chapter 5 Power management