HP Compaq Mini 311c-1140EI PC - Manual (Page 16)

Bottom components
Component Description
(1) Battery release latches (2) Release the battery from the battery bay.
(2) Battery bay Holds the battery.
(3) Vents (4) Enable airflow to cool internal components.
NOTE: The computer fan starts up automatically to cool
internal components and prevent overheating. It is normal
for the internal fan to cycle on and off during routine
operation.
(4) Hard drive bay Contains the hard drive, the wireless LAN module slot, and
the memory module slot.
CAUTION: To prevent an unresponsive system and the
display of a warning message, replace the WLAN module
with only a module authorized for use in the computer by
the governmental agency that regulates wireless devices
in your country or region. If you replace the module and
then receive a warning message, remove the module to
restore computer functionality, and then contact technical
support through Help and Support.
8 Chapter 1 Hardware features