One of the best definitions for “ultrabook”. However, it lacks some necessities, like an SD card reader, or upgradable memory.

1. Remove the bottom plate

This is one of the easiest notebooks to get inside. You only need to undo 5 Phillips-head screws, which stay attached to the bottom panel by the way, and then you can simply lift the panel away. Hardly needing any prying tools.

2. Battery

The battery is a decent 51Wh unit.
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https://laptopmedia.com/highlights/inside-lenovo-thinkpad-x1-carbon-8th-gen-disassembly-and-upgrade-options/