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I mostly don't use the front light and it seems likely that I get 16 to 20 hours.
Most of the power consumption is page turns, or other activity such as looking up a word, TOC etc.
So I'd expect a small font and small margins and lines pacing to give far more hours reading than big margins, large text etc. A font that allows more text per page will also increase run time.
Mostly I leave the Sage charging on PC after adding ebooks via Calibre and eject (twice if needed). So I rarely need to use the charger or be interrupted while reading. Also I have a 2m USB cable.
So while the Sage is poorer battery life than the Libra, it doesn't matter. You can carry a power bank if camping or travelling for use every day or two. A fast charger (1.5A 5V) takes less than 50 minutes from flat.
I don't find the screen grey when actually reading, only if it's "on" and lying on the desk.
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