Under technical details for the Kindle Touch, Amazon says:
Quote:
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A single charge lasts up to two months with wireless off based upon a half-hour of daily reading time. Keep wireless always on and it lasts for up to 6 weeks. Battery life will vary based on wireless usage, such as shopping the Kindle Store, web browsing, and downloading content.
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So I'm pretty sure it's two months and the at a glance description was a typo.
I bet the Button Kindle is only one month. It also has just 2GB of storage compared to the Kindle Touch's 4GB. A smaller battery and smaller flash storage lead to a lower price. $79 is a very aggressive price point.