Also, battery life improvement was very much expected. The resolution barely increased (for the 6), the GPU is more powerful, and the battery is larger. If everything else besides the screen size stays the same or gets more efficient, and the battery increases linearly, too, then the increase in battery life should be positive.
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You're confusing it with iPhone 6 Plus:
http://i-cdn.phonearena.com/images/articles/138994-thumb/iPh...
Also, battery life improvement was very much expected. The resolution barely increased (for the 6), the GPU is more powerful, and the battery is larger. If everything else besides the screen size stays the same or gets more efficient, and the battery increases linearly, too, then the increase in battery life should be positive.