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How to accurately measure laptop battery life in Linux?

tl;dr: I'm looking for something like AccuBattery, but for Linux

What do you use to measure laptop battery life in Linux?

I can easily get a momentary estimate of battery life. But this fluctuates based on load, screen backlight etc.

I'm looking for something that will collect my usage patterns over time - load, #processes, screen backlight, ... - and allow me to predict remaining runtime more accurately.

I'd love for the data to be parsable, so that I can analyze it myself and e.g. find the "worst offenders" - processes affecting battery runtime the most.

Thank you for any tips!

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