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Batteries only have so much juice, eventually they quit holding much of a charge - just like a laptop (my old laptop went from 3 hrs to 15 minutes of battery life in a year and a half). If you bought a used Kindle than you really can't make a general statement about the battery usage. With the wireless off, I always found mine was about the same as the Sony - but if you're in an area with weird or bad reception it can run the battery down MUCH faster if you have the wireless on.
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