HP Pavilion dm3-2010us Entertainment Notebook PC - Manual (Page 18)

Bottom components
Component Description
(1) Subscriber identity module (SIM) slot (select
models only) Located inside the battery bay.
(2) Battery bay Holds the battery.
(3) Battery release latch Releases the battery from the battery bay.
(4) Vents (6) 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.
8 Chapter 2 Features