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Carbon X1 (6th gen ), I can get 8-9 hours light stuff and solid 6 doing work. That is pretty much equivalent to the macbook 13.

I have a macbook 15 for work and am extremely disappointed in its battery life, so I think the Lenovo matches up well.

Bizarre. I probably only could get 3-4 hours tops with that Carbon X1 (might have been 4th gen?). What distro do you run? Mine was running Ubuntu.

Fedora - currently 31

I do have tlp running on it.

Could get close to a full day of work on the X1 Carbon Yoga Gen2. T480s not so much, but also packs a lot more punch. x1s seem to have best portability

I don't run Windows, so I have no idea. On the T-Series machines I get the larger battery and it lasts long enough for my purposes.