I doubt Apple is looking to increase battery life on their phones. They have plateaued since a while now and users have found their solutions that Apple seems to think is fine for everyone. Hence the new iPads not increasing in the battery life department. iPad Pro would have a longer battery life had they stuck with the old design, but the new chips allow them to go thinner and still stay on the same battery life. I think the iPhone will take the same route. It will be thinner and lighter. But the battery life will remain the sameYay…even more obsession with thinness.
Will be interesting to see how battery life hold up.