I've found that, even with wi-fi off, that "two months" life they give for the battery is being extremely generous. I leave my wi-fi off most of the time unless I'm shopping for new stuff, and I need to charge it about once a week.
But I tend to read three or four books simultaneously, so I think that constantly switching between books might be draining the battery like that. The "two months" estimate is probably with wi-fi off, with text as small as possible (to minimize page turns), and reading one single book during those two months.
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