My battery last so long that I don't bother to turn the wifi off any more. And (except for this month when I'm doing other things) I usually read for 5 or 6 hours a day, on week ends. I don't pay much attention to the battery, but I'll charge it at the end of the weekend, I suppose.
Is it time to ask Amazon about your battery? Or whether there is a bad file? I guess you could reset it to factory defaults first, but that's a pain if you have a lot of books on it. [That might be their suggestion anyway.]
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