I used to read sometimes on my Blackberry Pearl (really small screen!) until I got my Android phone.
I rarely would read for a long time on the Pearl since the screen was so small - when at home I preferred to use my Sony Reader or my PDA.
But on a few fast cross-country trips, trying to cut down on what I was carrying, I would take just the phone and it would last for the whole trip - a couple of flights and a quick change of planes.
That was with all the connections off, and the screen dimmed a bit, except during the change of planes.
I really liked the convenience of having some books along without having to carry an extra device, but that's getting into the "reading on your smartphone" discussion, so I'll stop here.
The battery did fine for long-term reading as long as I was smart about it.
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