I noticed the same thing with my K3 since I had added ~250 books in one go. It went from a full charge to 1/4 in an afternoon, I added another 300 books then left it on the charger overnight. Now it's back to full charge and finished indexing so now hopefully we can get a real test of battery length.
You can see if it is done indexing by doing a search for some random item, like "RRRRRR". It will come up with the search screen and an item showing how many items are still remaining to be indexed.
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