I don't have a Blackberry, but an Android. Androids are notorious power suckers. It so turns out that I quickly found out the one activity besides phoning that made the batteries last longer was precisely e-reading -- specially if you go white letters on black background.
I get about 3 hours worth of web browsing, taking photos, watching videos and all else -- then I gotta plug it into the USB PC port while at work. But if I just read ebooks, I believe it can endure all day long. Never tried it, because I mix e-reading with web browsing, but I'll try it when I get home today, after it's charged 100%...
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