I recently replaced my kobo mini with clara hd.
With the wifi and light off, the battery dropped to 0% in less than 3 days.

I have put the clara in my diy sleep cover. From the discussion forum, some suspected that the sleep mode using sleep cover exhausted the power rapidly.
Will kobo rectify the problem?
My kobo mini served me well without any issues for years.

It is annoying to find the reader freeze because of low battery when pick it up to read!
Is there any update firmware can fix the problem?