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2–12 Maintenance and Service Guide
External component identification
Bottom components
Item Component Description
Hard drive bay Holds the hard drive, memory module slots, WLAN module (select models
only), and WWAN module (select models only).
Vents (4) Enable airflow to cool internal components.
✎
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.
Speaker Produces sound.
Battery bay Holds the battery and subscriber identity module (SIM).
Charge level indicator Displays the approximate remaining battery charge.
Accessory battery connector door Slides open to expose the accessory battery connector.
Accessory battery connector Connects an optional accessory battery.
Battery release latch Releases the battery from the battery bay.
Docking connector Connects an optional docking device.