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180 degree display hinge
Lenovo has introduced a number of laptops with unusual lid hinges, the Yogas come to mind, and it seems designers couldn't help putting one on the T431s. This lid opens a full 180 degrees for those who find that useful, although this writer can't think of a use for it. It does mean that the display can be adjusted to any angle to suit any user.
The bottom of the ThinkPad T431s is sealed, meaning the battery is not user replaceable. This has become standard for most laptops so it's not unusual. The only unique thing on the bottom of the unit is the proprietary dock connector, indicating a dock option should be available at some point.
Left side ports
Lenovo has included a number of ports on the T431s in spite of the thin casing.
Power, RJ-45 (ethernet), VGA, USB 3.0, SD card slot, audio in/out jack, optional Smart card slot