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I guess you missed the latest news about those devices with 20 hour battery life and the performance of a Intel device weighing twice as much :-)

I doubt anyone would need to work anywhere near 20 hours without being connected at all. The vast majority of people work on desks with plugs.

Hey, where are you going with that goalpost? Put that down again.

Probably not, but if your are doing some heavy work the battery will last significantly longer.