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Originally Posted by seamusfp
As soon as you put a light on the reader you have have the same problem as LCD's with regards to battery life. You have a huge quiescent draw turning electrons into photons. While LCD's are not image stable like E Ink, most of the battery issues come from backlighting. Granted you could only use the light when needed, unlike most LCD's.
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My iPAQ allows me to adjust the backlight from 100% to off - and the supplied battery lasts for many days with my usage habits (reading for a few hours and using it as an alarm clock). If that isn't long enough, a variety of larger-capacity batteries are available for it.