Thread: Battery life, simple and easy specification, calculation and measurement
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Old 06-13-2011, 02:19 PM   #10
j.p.s
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Quote:
Originally Posted by Penforhire View Post
The essence of the post is true for almost every battery operated device. As consumers we never get that sort of analysis given to us by the manufacturers.

Take digital cameras for example. You'll see some manufacturers claim, "takes 400 images on one charge." But that assumes a fixed 'test' amount of idle on-time, only so much focusing for each photo, some average flash use (a HUGE variable on battery life), only so many on/off cycles, and only so much chimping (staring at a stored image on the display). The only thing that is normally consistent is they don't leave the camera off for long periods (letting the battery self-discharge).
Taking a picture on a digital camera is much more demanding on a battery than turning a page on an e-ink device, and has more complicated effects on battery life. See the crack by RichL above.

I really like the long battery life on these things and hope the one day (tops) tablets don't wipe out the 1 week (minimum) readers. I just thought it worth while showing a more accurate picture of how battery life varies with reading time and the very real but very worthwhile cost of using suspend mode. It is very nice to be able to just put the thing down when finished and pick it up the next day, or whenever, and be on the same page in a couple of seconds, and still have days of battery life left.
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