That's interesting- with active use my DR800SG lasts longer than my Sony PRS-900 (and I don't have any Sony auto-delivery of newspapers). The DR800 does take a long time to charge though.
If I leave my Kindle DX in sleep mode (screensaver on) and don't turn off wireless it doesn't last more than 5 to 6 days. If I turn wireless off and turn off the DX (screen is blank) it lasts more than a month in storage.
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