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These personal battery life comparisons are missing some important information. If you ignore any lighting, then most ebook readers only use significant power when changing pages (flipping the display and composing text) - very little (if any) power is used for a static display.
So, if you read fast & turn pages often, your power consumption will be much higher than for someone who reads slower (and turns pages less frequently).
The battery life expectations published are for a specific set of reading conditions (how often the page is turned and how long each reading session is).
Rich
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