From the
TechCrunch review:
"Battery life is only worth mentioning in that there has been some talk about a slight reduction in battery size for the iPhone 6s. I don’t know about that, but I can say that battery life is spec’d to be exactly the same by Apple and that’s the way it felt. Going from a heavy day of email, shooting pictures of my kid, meetings at companies like Facebook, video at a baseball game and late night Slacking all felt roughly identical on the iPhone 6 Plus and iPhone 6s Plus. No appreciable difference. To bed at around 20% with no charging during the day. If there’s any change in battery size, it’s likely more than made up for by the new power saving features in iOS 9."