Don't forget affecting all this is how many books you have loaded. The indexing process eats into the battery. My first charge lasted only two days (reading about 1-2 hours a day) as indexing was going on. I'm still on my second charge (same 1-2 hours a day reading) and have well over half the battery (5 days and counting). I keep my wifi and 3G on all the time, BTW.
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