I have all three Paperwhites and just by using them I can't really tell any difference in the battery life. I also have a Voyage with the same battery life as the PW3 according to Amazon and it seems the same to me.
I've never measured them so I'm just going by how it seems. I charge them every Saturday and they're always above 75% full when I do. That's true for all of them. I'm sure the older ones probably do get longer life with their lower resolution but not so you could notice.
Barry
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