I felt the same way so I actually went back to a 6 to keep the better battery life. No regrets. The 6S is indeed faster but the 6 was always fast enough so not much gained there.
I haven't noticed any differences in battery life between 6 and 6s. I have a 6 on iOS 8 and a 6s on iOS 9 and have tested this out on multiple occasions (for fun), using the same app set up and battery tests. They are either very similar, or the 6s wins with battery saver mode of iOS 9. A very slightly larger battery in the 6 should not be enough for a discernible difference, and from my experience they are almost identical in battery life. The 6s uses more energy efficient components which should even out the small capacity differences. Apple's engineers aimed to have similar battery life between the two phones and I think they achieved that.
I can't speak for the Plus models, as I never owned either of those to test out the battery.
I never noticed much difference in the battery life but I await the iPhone 7. The s models are always heavier.
Nitpicking (sorry) but 5s is the exact same weight as 5
3GS was more, yes but only 2 grams more and 4S was only 3 grams more. Very negligible weight differences in person. If you are able to discern a 2g or a 3g difference between two devices, I can understand how a 14g difference could be an issue.
The 6 to 6s is noticeable, I will give you that. As is the 6 plus to 6s plus. But not a problem unless 143g is significant weight for your wrist or a big enough difference from 129g (which could be a genuine problem if you have inflamed wrist joints or some kind of neuropathy along the wrist).
Further, if a lighter iPhone is one's priority, then the 5 or 5s are both sufficient and very functional on iOS 9 (I think they both run iOS 9 well especially the 5 given its age)
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