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From my Sony point of view up until recently I had PRS600 and the battery would last me 2 weeks between charges thats with reading around 2 hours a day. I now have a PRS650 and the battery seems to last longer but its early days for me on that.
However you cant just leave it "on" so to speak as the reader will put itself into sleep mode if it hast been used for a while. This still uses power but should still last 2 weeks.
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