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External component identification
Maintenance and Service Guide 2–13
Bottom components
Item Component Description
(1) Battery bay Holds the battery.
(2) Battery release latch Releases the battery from the battery bay.
(3) SIM slot (select models only) Contains a wireless subscriber identity module (SIM). The SIM slot is located
inside the battery bay.
(4) Docking connector Connects an optional docking device.
(5) Accessory battery connector Connects an optional accessory battery.
(6) Vents (7) 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.
(7) Wireless module compartment Contains a WWAN module (select models only) and/or WLAN module.
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To prevent an unresponsive system, replace the wireless module only
with a wireless 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) Business card holder Holds a business card.
(9) Memory module compartment Contains the expansion memory module slot.
(10) Hard drive bay Secures the hard drive.