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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
Right side ports
Fan louvers, miniDisplayport, USB 3.0 (powered)