I'm assuming that's the 6s Plus?
I abused the battery on my iPhone 6s Plus yesterday at midnight after it was syncing with my Mac and charged from 98% out of the box back to 100%. It was on standby for 18 hours and used for 17 hours. I never had that with the original 6. Never, ever. So glad I up the ante and got the Plus this time. No turning back at all. I'm getting use to the bigger screen and loving the resolution. And definitely the battery. Whew.
Yup. I hope the battery life that good when I'm actually using it the whole day.