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You're lucky, my thinkpad x13 gen 2 AMD gets 5 hours on modern Fedora vs. 9 or 10 on Windows.

I also have an X13 Gen2 AMD. My idle power consumption is 2.5W to 4W depending on brightness. This ends up in 12h-15h (machine/battery ist 2y old I think).

I think you can improve your power settings.

I have an AMD thinkpad and get maybe 1/4 the battery life on Linux as I do when I boot inti Windows, did you have to do any tweaking to achieve that?

I typically install and enable tlp [1], but that's it. Some distros/DEs might have it out of the box, but on Arch I had to do it myself.

[1] https://wiki.archlinux.org/title/TLP

TLP, as mentioned. Also powertop for more in-depth view of what's happening on power consumption front.

Does that mean that Windows's battery life suck equally on these devices?

I think MacOS was implied...

Have you ever put MacOS on a PC laptop? Terrible hardware support and the worst battery life of any OS.

I used to hackintosh every laptop I could get my hands on that could do it, and always saw better battery life on OS X vs. Windows.