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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).
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