The 8,000 page turns is one of those useless market numbers that all the vendors like to quote. It appears to be a number from e-ink for just the screen and controller and ignores the power required for the processor and memory for text rendering. Bookeen has been making firmware changes that impact the battery life.
If I never power off the device i was getting 4 full days but the battery died on me once on the 4th day so I started charging it every 3 days.
If I power the device off between reading sessions I got up to 13 days but sometime only 10 days. When I use it in this mode I charge it once a week so I don't forget.
I'm on a 3 day business trip and didn't bother taking my charger with me. If I go on a one week vacation I would take a charger but I use the same one that I use for my iPod so it's just one extra USB cable.
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