I've never used a Sony ereader, so I don't know about them. For the Kobo ereaders, a broken book can only affect the device when it is doing something with the book. Those times are:
- During the book processing when the device is disconnected. If the book is bad, it is most likely to cause the processing to die and that batch of books won't be added.
- When a cover image is needed. The first page of the book is rendered and the cover displayed.
- When reading the book.
In each of these cases, a bad book is likely to cause more processing and hence use more battery. But, so will a large book or a complicated book. And unless a process is left running in the background because of a problem, after each of these is done, there won't be any extra power used.
If someone has a book that is causing problems at other times, then I'd like to see it. That way I can work out why it is happening.
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