What does a laptop that weighs just a kilo look on the inside?

1. Remove the bottom plate

Despite being such a lightweight device, Fujitsu is using 16 Phillips-head screws to hold the bottom panel to the chassis. The good thing is that the company was aware that you’re going to be tired after you undo all of the screws, so they practically didn’t put any clips on. You just need to lift the panel away, and boy it looks as thin as a sheet of paper.

2. Battery

Powering the laptop, when it’s away from the plug, is a 50Wh battery pack.
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https://laptopmedia.com/highlights/inside-fujitsu-lifebook-u9310x-disassembly-and-upgrade-options/