Quote:
Originally Posted by j.p.s
E-ink displays only use power to change the screen. The number of pixels that change between pages is what affects power usage, not what color the background is.
No one has given any reason for changing to invert mode before putting the Kindle to sleep would save power. I am very skeptical that is true.
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The brightness level of the front-light will affect power usage. If invert mode also reduces brightness level (I can imagine one would want it to be at least a little lower with black background), then that will save some power.
I agree that it should not matter which mode it is in before putting it to sleep. At that point there is no screen refresh or front light.
One thing that can happen is that the sleeping Kindle will (I think) periodically try to poll Amazon to see if there is content or an update to download (if it is not in Airplane mode). Normally that will not consume a lot of power, but if WiFi signal is weak, or the spectrum is saturated with competing wireless access points (apartment buildings etc.), it can drain power faster because connection gets dropped, it retries etc. It is surprising how variable signal strength can be just moving a few feet, depending on antenna placement, structural features of the building and spectrum contention. So this could account for some variation in overnight battery drain.