On average, you should get 10 to 12 hours reading time, assuming you read frequently. I read about 2 hours a day and I charge every 4 or so days. If you read less frequently, say 1/2 hour a day, you will get less reading time out of the battery, as more power is consumed between reads, while the device is asleep. Other things affect battery life, like how long you have the LCD on (for browsing your books, looking up words, bookmarking, ...), the radios (WiFi and 3G), SD card present or not, ...
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