I also don't understand why the Whispernet is trying to send books that you already transferred via USB cable. When you purchase - are you selecting "Transfer via USB?" or are you buying them via Whispernet and then going to the Manage Your Kindle page and downloading again via USB.
I always carried more than 1,000 books on my K3 but after the initial index from setting it up, I only added 1 or 2 at a time. Indexing that many at once will almost certainly deplete your battery.
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