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First, try disabling the sleepcover in the options and putting it to sleep manually, and see if the battery still discharges abnormally.
If it does, it might be a problem with one of the books you loaded on the device. Do you remember when this problem started happening? You could try removing the books you added from that day onwards, reboot the device and see what happens. The epubs can be checked for errors in Calibre using the editor.
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