I cannot speak for the Kindle DX, but I've had three Kindle 2's and none of them have had the advertised battery life--not even close! If Whispernet is on, the batteries will drain in less than a day, at least on my three K2s. With Whispernet off, the batteries drain in about 20 hours of use. My Sony PRS-505 battery, on the hand, lasts for weeks.
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