Originally Posted by FFaser
And what i meant was that with norefresh nook make noise even if nothing on screen change.
Thanks, that was a useful observation! I'd noticed when testing with a relatively CPU heavy application that power consumption didn't seem to vary between a static or moving image in A2 mode (iirc 12.5 hours of battery life with moving image, 13.5 hours with static image), but took this to mean that power consumption from the eink screen was negligable at the slow (~1fps) update rates I was using and that the CPU usage was responsible.
Sounds like that's not the case, and it's useful to know the only real test required is to listen to the screen