Appalling Battery Drain iOS 12.1.4 across multiple devices

I have been using iPhones since they first arrived and know exactly how best to use them. I am also convinced this update has caused problems. When reviewing the battery usage app for the previous night it shows a steady drain with no apps running. On the 6S I did a factory reset on the phone with iTunes and set it up as a new phone. aside from signing into to iCloud I installed no apps and just left it as it was. The battery discharge was exactly the same and within 6 hours the battery was completely flat. Battery health is displayed as 98%. All of these devices were absolutely fine until the 12.4.1 update, its too much of a coincidence. I am moving back to Android until this is sorted.

I am an experienced electronic engineer, a well known worldwide power supply and battery charging expert. I have been developing all types of power supply and chargers for everything from oil rig platforms, military jets to consumer devices and battery packs so I know what I am doing and what I am talking about. I don't need to buy new devices as we already have them here, what I would prefer though is for Apple to fix the problem. I am in the process of installing iOS 13 Public Beta on the 6S, I will update this post to let you know if that solves the issue. In the event I can do anything with the 6+ I will open up the device and measure the actual current drain whilst the device is sleeping with and without cellular/wifi and send that discharge information to Apple.

You are not alone, The reason I posted this in the first lace is due the large number of people I speak with who have seen regarding battery problems since the inception of iOS 12. iOS 12.4.1 is the straw that broke the camels back. What frustrates me most is how software like this is ever released. Surely engineers and users in Apple must have tested this update on everything from iPhone 6 upwards, or did they? Or are Apple still using the public as their testing guinea pigs?

The phone I may investigate is the 6+, well outside its warranty, although it is old it is in perfect condition and was never experiencing issues until this last update.

The installation of iOS 13 Beta is merely to see if iOS 13 Beta performs better than an official 12.4.1 release, if it does then it proves that even a Beta software, unfinished is better than a fully tested released version.

We shouldn't be expected to replace phones because the recent updates render them useless with no options to revert back to the release that worked. We should be allowed to roll back software if we choose, its our decision. We have purchased our devices with hard earned cash, what we do with them should be our choice. Apple however take away those choices. I usually have two options, accept the inability for the device to work with the latest update or rollback to a previous iteration that worked, the later option has been removed by Apple.

Even Windows 10 and MacOS allow you to roll back software to uninstall recent updates if they cause problems, or even install older operating systems, but for iOS devices Apple seem to think they know better than we do, in some cases that may be true, but in this case it is not.

The previous posts should read iOS 12.4.1