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Typically my kobo holds its charge just fine and drains very slowly as I read books and will stay above 80% for many days.
However, every now and then it drains very rapidly from full to half charge.
Typically, this is associated with the wifi being on and the kobo constantly scanning for networks and only finding ones that it can't connect to, or a PDF file that was taking a very long time to change pages, or searching in a large PDF file.
If the problem was triggered by a PDF file, sometimes the battery will continue to drain even when I'm not reading the PDF anymore -- like it is still trying to search it in the background or something, or maybe the PDF renderer is stuck even through I'm not using it anymore.
If I notice a sudden unexpected battery drain like this, I have found a reboot and turning off wifi will stop the drain.
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