i have a 14 pro, about 8-9 months old and still at 100

iPhone 12, 80%. The update to iOS 16 did most of the damage, I lost 5% in 2 weeks

We don’t know! Every battery in every single phone is different. It’s impossible to tell and if someone is telling you otherwise he don’t know what he’s talking about.

Better than mine. Coming up to 2 years @ 88%

92% on iPhone 13 Pro after 27 months.

The iPhone 15 Pro Max has a fantastic battery. I charge it once during the day to ~80% after it charges down to ~60% and then charge it up to ~100% before going to sleep, then I unplug it overnight. The battery life is exceptional and iOS 17 is definitely optimized for the iPhone 15 Pro Max to last through the day with normal use and through most of the day with heavy use and also by offering features like seeing your battery cycles in General -> About -> Battery.

I recommend you upgrade to the iPhone 15 Pro Max. I just upgraded from my iPhone XS Max that had a battery health of 84% before I upgraded. I absolutely love this phone. It blows the iPhone 14 Pro Max out of the water.

This is hardly a revelation, but older iPhones definitely hold up better in the battery health department. My old 12 mini was used very heavily for 2 years (including multiple recharges per day) and it was only on 87%. Curious to see how this 15 Plus handles things with a bigger battery.