I've only had mine for a few weeks, but I've charged once in about 2 weeks...I only turn on whispernet to d/l books, and then i usually leave it on for a few hours (figuring it can back up my books and do all that stuff) and then turn it back off again. I charged it when it hit 3/4 full...but I might wait until it hits 1/4 next time to see how long it takes.
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