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Even though you've put the Kindle to sleep, it's not turned off. So, while you're letting it sit there on the shelf, it's busily indexing the book (or books) you just downloaded so that later on you can find any passage you want with a search. Now, this probably doesn't use 75% of the battery's total power, because it's quite a drain on the battery to use the Whispernet -- and the more you download, the faster the battery drops. Since power display isn't continuous, you see these abrupt drops to one of the pre-set levels. That can be disconcerting at times.
What I do is keep the Whispernet turned off -- unless I'm specifically wanting to download something. Most of the time I purchase from my browser and the book just stays queued up for a later download -- rather than purchasing directly from the Kindle. When I'm ready to download, I put the Kindle onto the mains power and turn on the Whispernet. After the download has completed, I turn off the Whispernet but leave the Kindle connected to the mains for at least an hour. If it's convenient, I'll read while the Kindle is connected -- if not, I come back later and unplug the Kindle. By now it has a fully topped-off battery and it's finished its indexing.
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