The slot is where ExpressCard (TypeII, 54mm) is inserted.
ExpressCard Type 54 allows insertion of either 54mm or 34mm
cards. ExpressCard integrates both the PCI-Express bus
technology and USB2.0 interface.
10. 4-in-1 Card Reader
The 4-in-1 Card Reader supports SD Card, MS Card, MMC
Card, and MS-Pro Card.
Bottom View
1. Battery Pack and Battery Latch
The battery pack is a built-in power source for the notebook.
Slide the battery latch to release the battery pack.