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There's a lot of hope for battery life between screen power improvements, battery technology, the new lower power processors, and the lower power radios (wifi/bluetooth/phone).
Even now, I think there is an extended battery available or soon available that will give more like 5hrs battery life. That could add some extra weight and maybe even slightly more bulk, but still it is a good sign that it might not take any unexpected advances to get battery life into a reasonable range for a full day's work.
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