My PW1 is a 3g model. With wifi and 3g always on and screen at about 14, I get about 12 hours.
My PW2 is wifi only. I keep wifi always on and the screen at 12 or so. So far, I got about 16-18 hours.
I am not sure why the difference is so marked. Overall, they both are pretty disappointing for e-ink devices, but it's not the end of the world.
I noticed that how I use it seems to make a big difference too. When I read newspapers/magazines and 'jump around a lot' in documents, battery life suffers.
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