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I would go with a used laptop like the HP tx1000 its under 5lbs with the larger battery it should last 3-4 hours running Vista on balanced power profile. The max watts the power brick can draw is 65w so it can be unplugged most of the day and easily charged or hibernated then replace the battery and you are ready to go again in 5min.
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 I move at the speed of awesome.
"It's not rocket surgery!" -MetroMPG
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