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I'm using it daily, but only for reading technical pdfs (something as 15-30 minutes per day - I use it while in the subway). I don't use the notes feature neither wifi or bluetooh (both disabled).
With this use, the battery lasts quite long, I would say 2 weeks at least. I haven't really measured, but battery is definitely not an issue for me.
Maybe it depends on the use of it. I guess that annotations, because they constantly refresh the screen, are more power consuming than simply reading pdf, for which the screen is refreshed only when you turn the page.
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