Those two things have a minimal effect on battery life. They are not spinning hard drives but data stored on solid state memory card.
Dont wory two much about battery life, I read for at least an hour a day, never switch my reader "off", just to "sleep" and only have to recharge about once a month.
As long as you don't play MP3s, they will empty your battery within 4 hours, you are good for abouth a month worth of reading..
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