Well some eBook readers actually draw a picture on the screen when you shut them off. Kindle does that. No power, nada, but the image stays. After a few weeks it might not have quite as much contrast due to the little balls of e-INK drifting out of place but the image will still be there. It can be a bit unnerving when you battery runs completely down to see the screen still displaying the image but none of the keys work any longer. You think it is locked up but in fact it is off without any power whatsoever.