Compactflash Cards; Automatic Power Off - Compaq Aero 1500 Series Reference Manual

CompactFlash Cards

CompactFlash cards can consume quite a lot of power. If you don't need
the services provided by an installed CompactFlash card, such as a
fax/modem, consider removing the card while running the system on the
battery pack.
Infrared Transmissions
Infrared transmissions are power consuming. If possible, refrain from
transmitting large documents or files through the infrared port while you
are using the system on battery power.
Active Synchronization
Synchronizing the data on your Aero 1500 Series with your desktop
computer consumes power. Whenever possible, arrange your
synchronization routine so that it is transmitted through the cradle while
your system is powered by the AC adapter.

Automatic Power Off

You can program your Aero 1500 Series to automatically power off
whenever it is idle for a short period. If you are running on battery power,
it might help to conserve charge if you shorten the interval before the
system automatically powers off.
Tap Startà à Settingsà à Power, or Qà à Power, then the Power Off tab.
(Tap Startà à QLaunch to make the Q icon appear on the taskbar.)