I get 10 hours of my usage on my framework. It really depends on model and your setup.

https://errande.com/2021/09/linux-laptop-battery/

My old laptop got a new life after switching to minimalist linux instead of windows. So much longer battery time. Extended lifetime by years.

On r/thinkpad (I think), I at some point read about the AMD powered machines having extraordinary battery life on Linux, to the degree that I regretted my very recent Intel ThinkPad purchase. Maybe that's something to search for. I think it was the new T14.

im getting pretty similar results to what it was on windows i think. endevouros kde on lenovo yoga, with tlp conservation mode when charging.

Using a Matebook running NixOS as my daily driver. Battery life is pleasingly good, lasting up to 9 hours. This without tinkering with battery settings at all.

I have ~1.25hrs of uptime on Windows. Almost the same, if not more, on Arch.

It's really almost the same.

With mine (an Acer Aspire A515 I got for free from where my mom works) I get around 3 hours (according to the time remaining, although in longer use sessions at my desk I usually plug it in every hour or 2, and unplug it when its full), which is about the same as Windows thinks it is. So i would say it gets around the same battery life whether I use Windows or Linux

I'm sporting 8-10h on my Tuxedo Pulse 15 (Gen 1)

At least with AMD my runtime was always pretty good under Linux. Since some years at least. Was on Intel before and always had worse battery life with Linux - most probably because of the additional NVidia GPU, that didn't play nicely with Linux power management

Depends on the device. Some devices are horrible but some last for 18+ hours.

It's around the same for me, altough windows is slightly better when battery saver is activated (hp pavilion 14 with an i7 1255u, windows 11 and fedora 38)