Quote:
Originally Posted by murraypaul
Because with eInk readers time spent reading is irrelevant, what uses power is changing pages. If you read fast, and change pages often, the battery will last less hours than if you read slowly and change pages less often.
When eInk readers were introduced, battery life was described by number of page turns, but that wasn't 'user friendly' enough, so they invented a 'lasts X weeks' calculation based on a standard reading speed. 1 turn a minute for 150 hours is 9000 page turns, which from memory is about what the PRS-505 claimed when it was introduced.
It used to be that they quoted based on 1 hours reading per day, but as battery life dropped, they changed to use 1/2 hour instead, so they could still claim months of battery life.
A device with an active light, however, does use power all the time it is on.
Who reads for 1/2 an hour a day every day?
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The "no power unless you turn pages" theory is wrong for touch ereaders. The touch mechanism uses power all the time, partly to generate infrared beams.