Most high tech devices use recharable li-ion batteries which can lost quite a long time. My portable MP3 player lasts 11-12 hours (20GB HD-based), my laptop (1.5GHz Pentium M, 768MB RAM) lasts around 7 hours.
All of the "virtual" textbooks I've seen proposed are variations of tablet PCs, with li-ion batteries...
All of the "virtual" textbooks I've seen proposed are variations of tablet PCs, with li-ion batteries...
If the power is out for 60 minutes or longer, you're not doing much in school, period. Technology or not.
My high school libraries have never had Windows, and I doubt most have sufficient lighting anyway. Not to mention most libraries are computerized, anyway.
Anything else?
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