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Sorry, I have a hard time measuring battery use in just reading, or just annotating.
For me, the main drain is WiFi. With WiFi on (and probably most of the battery saving features off) it lasts about a day or two.
With Wifi off, it easily lasts a week of usage. I used it over a day of note taking at a conference, 9-5, and battery was still at the full 3 bars.
I prefer to sync with the USB cable, and then syncing also charges the device so I rarely have to just charge it.
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