HP Pavilion 15-p020ca Notebook PC - Manual (Page 28)

Bottom
Component Description
(1) Battery lock Locks the battery in 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) Battery release latch Releases the battery.
(5) HP Triple Bass Reflex Subwoofer (select
models only)
Provides superior bass sound.
16 Chapter 2 Getting to know your computer