Kobo does not index like a Kindle. There is a process where each book is identified and adding to the database, but that's generally finished within a few minutes.
However, it's not unknown for a problematic book (usually some kind of data corruption) to cause part of this process to get stuck, causing battery drain. As Kobos don't have any kind of cpu monitor, checking for this is more a process of trial and error. But first is to check if simply recharging and rebooting the device works as normal.
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