It says some have claimed 60 - 70 hours. The claim that review actually makes is true for me, as long as I don't do extensive note taking:
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the device shouldn’t have any problems with lasting a day on a single batter charge.
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When device and battery were new I used to charge it every other week, which for my use at that time got me about 20-40 hours of reading out of a charge. By now the battery is degrading - helped I'm afraid by that stupid bug that drains it every once in a while. Nevertheless, when it doesn't decide to drain itself and I don't use it as a notepad (for meetings / during courses), I still don't come up short during a work day's use.