There is considerably more battery drain by the wireless radio of any Kindle, if you are in fringe areas where the coverage drops down to 1xRtt speeds (equivalent to 35-90kb/s). And for ~60 books, that may be just about right...
LAst Friday, when I received my DX, I decided to send it all my ~170 books via whispernet, and while in my office at work I noticed that the radio kept switching between EvDo and 1xRtt constantly. I ended up having to plug it in the charger after only the first ~50 books because of that...
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