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Actually efficient hardware and better batteries. I'm really interested in owning a laptop or mobile some day that can comfortably work for 20+ hours without being charged.
I forget where I read this, but someone posited that the goal has always been "all day" battery. Ever since the first smartphones ,we've had, largely, the same battery life. It lasts most of the day and that's good enough for most people. The secret, though, is that actually the batteries have gotten way bigger and more energy dense, it's just that the processors and mobile radios are also more power intensive.
I suspect if you put a modern battery in a 5 yr old smartphone it would last 2+ days. But you'd have to deal with 3G radios, bad GPS, and slow performance.
I'm sure if I put a high density battery in my old eee PC, it could probably run for days.
I really hate that we've gotten such energy intensive applications. And honestly, I don't think for a lot of them they have gotten much faster. They are bloated and programmers have been allowed to do that since every machine has so much extra resources now.