Thanks for the replies.
On a general note, can someone explain why battery life seems to get worse after each iOS update? It's like a "standard feature" of an iOS update along with the common response from people that start complaining about how the update killed their battery life. I actually observed this myself. On iOS 16.4.1 I could get around 1 hour 30 minutes of SOT when the battery hits 90%. I would actually be still be at 100% with 30 minutes of SOT. On iOS 16.5 is it quite a bit worse at 1 hour of SOT at 90% battery.
Its one of those things that people love to go on about, and its not only iOS related, you find similar talks on other forums with other devices.
Parts of it is true, there have been some releases that might have had an impact on battery time depending on a number of things. Much is down to how we use the device.
Also, before it was common that after an update there was some processes running for some time afterwards making the device consume more battery.
Another reason could be that battery statistics are hard to measure, again for many reasons. We use our device differently with different peripherals. Some might be using Wifi4 and another Wifi6, and Wifi6 is more energy efficient.
We use different services that affect batteryperformance.
With every update usually software/app manufacturers have to test and update their software too since there might be bugfixes, new bugs introduced and//or new fetures added or features deleted.
Battery management is another piece of software that is constantly evolving and the OS plays a huge part in that too.
If you look at tests where they take bog standard phones with just the OS and apps and test battery performance you will notice that they aren't that big differences, sure there are the odd release that improve battery or drains if fast than it should, but overall its pretty similar.
But havin said that, if you look at a phone from when its released you sometimes have features that are added that can drain battery more if being used and also, sometimes security patches take a hit on performance that can affect battery life. A good example is to look at the Intel CPUs that hard a hardware issue that was "fixed" via software. But that lowered the performance of the CPU which could affect battery performance.