installed iOS 18.6 RC (b4) the day it came out. Noticed by the next day I had better battery life than iOS 18.5 (which I was on before). Also, noticed the phone gets less warm than before too.
I can second this. My 16 Pro isn’t getting as warm now since installing 18.6 RC, even when charging it feels cooler for whatever reason. Battery life much improved over the last few betas.