I have an extended battery for 8 hrs (big brick) it went to 12 hrs of email, office stuff use. Seems ok to eyes. I still prefer my nook or edge for reading books, I think is the black and white I like, also not comfortable reading from an laptop, but ideal for work from my garden (or beach). I think the ideal dual screen device will be an android device, very slim, 2 screens one side e-ink the other pixel qi, but quarter of the tickness of the edge, more likely likely the thickness of 2 nooks. edge is far too heavy now.