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The Librem 14 has great battery life and in this post we put it through its paces from low-power idle tests all the way to a torture test that pegs all 12 threads at 100%. Check out this post and video for all of our tests and results: https://puri.sm/posts/librem-14-runtime-and-charging/
@purism even running Qubes OS it's pretty good. I'll be running some tests in a week and share my findings related to "normal" and "heavy" workloads on mine.