I don't think there is any argument that the Kindle has better battery life due to not having to power Wifi and a color touchscreen. To maximize the Nook battery you'll need to turn off all wireless including the 3G. In other words, use Airplane Mode. That said, I don't mind the Nook battery capacity even with Wifi on, but we're each individual and have to decide how many hoops we're willing to jump through to get the battery capacity we desire.
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