Sending a ton of books at the same time will chew up the battery, so be aware of that. It is possible to clog up the indexing process on a Kindle also. I had that happen once a few years back. I had to remove a bunch of books and start over. If books aren't indexed, you can't search in them.
Some books, like large reference books, can take hours to fully index. There are some study bibles that take the better part of a day to index. That process is also battery intensive.
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