Hello, Im currently tired of commenting, asking, and seeing this issue all over the place. I dont really know what is happening in Apple but it seems that Battery is not getting fixed anytime soon. My iphone 7 is about 1 year old, and since ios 11 I get quick drains of battery (about 10%) within minutes of use.
Sadly I thought that this was getting fixed on iOS 11.3.1 but it keeps heating up a lot and then theres the drain. Battery health apparently 86% which is quite fair, but I dont really think it reflects its performance. Also im afraid about damaging the battery when the phone heats up while using safari or just texting someone.
My 6S gets this issue exactly, despite iOS 11.3 claiming my battery health, and third party apps claiming my battery health is perfectly fine and it’s running in performance mode only!
After iOS 11.3 it was fine for about 3 weeks then it started to drain and it’s definitely worst under the latest update.
Basically Apple have broken my phone but claim it’s fine IMO. Or they do have a design flaw they are trying to hide which I think is also true but I’ll just wait and get a new iPhone this year at some point.