After waiting and waiting for Apple to Get It Right, I we finally upgraded our two iPads and iPhone 6S' to iOS 11.3. All was well. Since Apple screwed the pooch for every 11.x up until then, and finally got it right, I stupidly assumed they wouldn't screw it up again on 11.4. So when it appeared we just went ahead and updated. Big mistake Both my wife's and my iPhone 6S' now go through battery like there's no tomorrow, now more than a week after the updates. Strangely: Mine was fine until about three days ago--then it started doing the same as hers. E.g.: Her phone (battery health 98%), after being off the charger only four hours and being used only to make a couple very short calls (1st did not answer) was down to 23%. My phone, battery health 87%, is down to 91% after having been off the charger for only 50 minutes, with only 6 minutes of usage. This is not acceptable. If Apple does not address this soon I guess I'll have to assume they no longer know how to push a reliable mobile OS out the door and reluctantly, very reluctantly (you have no idea), return to Android I guarantee you: If we do that we will never again come back to Apple. (This is one of those times I can confidently say "never.") And, yes, before you even ask: Already half-lobotomized both phones by disabling a bunch of stuff. Besides: This never used to happen.