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The real difference in power usage between devices tends not to be how much power the screen uses, but rather how much power they use when "asleep".
Eg, the Opus battery will last about a week with the device left in sleep mode, whereas the Kindle genuinely uses zero power when asleep - you can leave it sleeping for a month, and the battery level will be pretty much the same when you turn it back on as it was when it was put to sleep.
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