Another option if you want a skinny, cheap laptop....
....which isn't tethered to the internet would be the Acer Chromebook 14 on which this is being written.
- very cheap (160 pounds UK)
- very light (less than 3 pounds)
- good 14 inch screen (but only 1368x768)
- HDMI output
- slot for SD card to extend file system space (from 32MB installed)
- no moving parts (everything is integral with the motherboard -- so no fan)
- runs Linux like a champ (Fedora 24/XFCE right now)
- 10+ hours away from wires and wall sockets (might be 12+ hours -- never tried)
Minuses (probably depends on personal taste):
- no touch screen (not a minus for me)
- no upgrades possible (apart from the SD card) so the RAM is fixed at 2GB
- no CD/DVD drive
As an aside, the base 32GB RAM is plenty when running Fedora/XFCE since the software footprint is less than 5GB.
This is the laptop I should have had ten years ago...cheap, light, good screen and plenty powerful enough for 95% of everything I need to do.