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I ran two tests on my Kobo Libra Colour.
On the first one, I had wifi off all the time, brightness from 2% to 25%, sleep mode only.
The battery lasted (from 100% to 10%) for 39.2 hours of reading over 15 days. I don't have the exact screens count, but considering my usual setting and the length of the three books I read over that time, it should be around 3.5 to 4K screens, with tooooooooooooons (and I mean tons) of highlights taken.
On the second one, I had wifi off most of the time, but I turned it on a couple of times to sync new purchases, and I used the pen for maybe 20 minutes total, same brightness levels as for the first test, and sleep mode only. The battery lasted for 29 hours over 27 days (roughly 2.5 to 3K screens and 6 books).
Note-taking with the pen is the single thing that consumes the battery the most on KLC. 1 to 2% is the drainage you usually have if you keep your device in sleep mode for a full day without reading anything.
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