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I'd say that worst case on a new device with a fresh battery, no stylus usage, no wifi, running custom apps (haven't tested FBReader's effect on battery life, if any), you can expect at minimum 10 hours on a charge.
I'm confused on the point of USB charging. You want to charge your book reader with a laptop, but a laptop battery typically last ~3 hours (less when charging something). How do you charge the laptop?
Maybe it's because I always have access to a power outlet when traveling, but I never saw USB charging as all that useful for anything.
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