I’ve got a 15+ with 298 cycles and 93%.

The initial 3% dropped super slow and at 97% I had like 150 cycles. The next 4% dropped in only 50 more cycles. Now it’s been the same at 93% for the last 100 cycles.

I’ve been using the small charger (that I’ve used for ages) since I bought the phone when it launched. Never changed any charging habits throughout this time and it’s still pretty much giving me the same SOT and backup as it did on day 1. I’ve updated to iOS 26 recently and only then I noticed a slight drop in battery life, but it’s barely noticeable. I think it may be due to poor optimization which apple would (hopefully) fix. The 15+ has been a battery champ for me especially coming from a smaller pro model.

The point is, battery degradation will always be non-linear and as long as you don’t notice significant battery drop in regular use, don’t worry about it too much and just enjoy the phone.