Actually, asus laptops used to have amazing battery life. I have a z70va with a x700 128 (yea, it's gettin kinda old) but when I first got it, I got 5+ hours out of it, and after over a year and a half I'm still getting about 4+. And mine was only about 5.5lbs. But yes, the last year and a half of asus laptops fit your description, but maybe that will change? :D
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Actually, asus laptops used to have amazing battery life. I have a z70va with a x700 128 (yea, it's gettin kinda old) but when I first got it, I got 5+ hours out of it, and after over a year and a half I'm still getting about 4+. And mine was only about 5.5lbs. But yes, the last year and a half of asus laptops fit your description, but maybe that will change? :D