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The e-ink display doesn't consume any energy until you turn the page but the rest of the components do. The CPU and memory are still consuming power and there has to be circuitry checking for page turns. Most devices can go into sleep mode which puts the rest of the components into a low power state without shutting the device completely off. It's confusing if you're not used to it because when the battery fails completely there is still text on the display.
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