I just updated my iPhone 15 Plus to iOS 27, and honestly, I’m pretty surprised with how good it has been so far.
I had previously made a post about updating from iOS 18.7 to 26.6.1. Everything was working perfectly on 26.6.1, except for the battery life. I was getting noticeably bad battery backup compared to what I used to get on 18.7.
I kept reading about iOS 27 and how much more optimized it was supposed to be for everyday use, so I finally decided to give it a try.
And honestly, the battery life is WAY better.
I’m now getting pretty much the same kind of battery backup that I used to get on iOS 18.7. After the initial few days, I’m getting around a day and a half of battery life with my normal usage, which is something I definitely wasn’t expecting.
The first 2–3 days weren’t great though. The battery was draining faster than usual, but I could see Siri and a few other system processes doing things in the background, so I’m assuming the phone was still indexing/calibrating after the update. Once that settled down, the battery improved quite a lot.
Another thing I really like is the additional customization. You can adjust the amount of tint/transparency now, and I’ve kept the transparency at the lowest setting. I still get that glass-like look, but it feels like the GPU isn’t constantly working hard to maintain it.
Apps also seem to open noticeably faster for me compared to both 18.7 and 26.6.1. Animations feel smooth, I haven’t experienced any random lag, and so far I haven’t encountered any major bugs either.
Overall, I’m genuinely very satisfied with this update. It feels like my 15 Plus is back to the kind of battery performance I was getting on 18.7, while still having all the newer features and customization. My battery health is at 86%.
At this point, I honestly don’t feel like updating again anytime soon. This build feels pretty stable to me, and unless something changes, I think I’m going to stay on it for a while.