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Your conclusion is wrong. There is no difference in battery life if you compare to 14 Pro on their site.

More than one component in the device draws power. Did you see the part about the display getting twice as bright, for instance?

15 Pro has the same brightness specs as 14 Pro.

Their website is not a reliable source for performance numbers. We'll have to wait for third party benchmarks

I disagree. Apple is the only site that gives realistic numbers rather than theoretical maxes.

Independent benchmarks are good, but Apple keeps everything very focused on what an average person buying it would experience, even benchmarks.