I also think that the battery life should depend on the font setting (and therefore how often you turn pages), how often you use the dictionary, using the new features etc. Do you read more at night than during the day? How does that affect the light setting? It is difficult to generalize those personal habits to come up with a standard. Perhaps you can compare to your last reader, its standard and whether your habits have changed in a way that would improve or lessen the battery life.
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