I'm consistently getting about 10 to 12 hours from fully charged to 30% with WiFi/3G always on and light level around 14 on average.
At least it goes all day and then some as I cannot read more than 12 hours during any day. Usually long before 12 hours my eyes will give up, not to mention that I would rarely have 12 free hours in which to read on any given day.
My screen is bad so when the 2nd replacement arrives today hopefully it will have a better screen which will allow me to use a lower light level. If so it might get better battery life.
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