Quote:
Originally Posted by j.p.s
To be a bit more specific, with the light off, the 7.8" reader uses 69% more power per page turn because it has 69% more pixels, but it needs 1/1.69 as many page turns, because it has 69% characters per page. Justification, paragraph length, and chapter length will cause these ratios to vary. That is, the cost per page turn ratio is pretty much fixed, but the total number of page turns per book for each reader will vary.
So, as DuckieTigger writes, on average, it is a wash, but YMMV.
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You're forgetting the time it takes for a cpu to up and down throttle.
Basically, after every execution, the CPU goes into a sleep state, and disables cores. Every time you execute something, it goes out of this sleep state, which probably consumes just about as much battery, as the calculations it needs to make to render the new page.
Reducing font size may prolong your battery life by a few seconds, to 1 minute, over the course of several days use; but it's a valid argument nevertheless!