could be defective, or I remember reading something about poorly formatted books having an impact on battery, too.
also, I think there was a thread about a cover that was made so that it constantly annoyed kobo's IR system when closed and that discharged the battery.
I do think 3 days 1/2h a day reading is way too fast! Yes the battery has to calibrate in the first charges but that's a bit too much..
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