Battery Drain on iPhone 16 Pro - iOS 26.1

Depends on what third party apps you have installed. Provide the screenshot of what you see at Settings > Battery with the green battery graph along with the top apps consuming the battery. Is Instagram there? That one has been identified as a notorious power hungry app, but we would need to see your list.

A note on your Battery Health, don't be surprised if you see it drop as on average the charge cycles would indicate that the battery health would be closer to 95%. Even that is not bad, just don't want you to be surprised if it happens.

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I am getting all day battery life with iOS 26.1 without using any of those methods you described to cripple your device, so I suspect you are experiencing a specific app related issue on your device.

The screenshot is more beneficial as it shows the green battery graph that has the rate of the drop and the apps show the percentages with the other important factor being background activities and how much time is spent on that. I haven't use Chrome on my iPhone, but on my Mac if I use it, the fans start to run up and Activity Monitor spikes on CPU use so I do know on that platform it is quite power hungry.

For reference, my phone is the regular 16 and I average about 8-9 hours of Screen On time. Never have to charge it during the day and just charge it all not every night with the Optimizing Charging option. Don't really pay attention to how much battery is left at the end of the day because it never has been an issue. Mostly use Safari, Messages, and Mail with a bit of gaming in between. I never use Airplane Mode, Low Power Mode, and have not turned on Reduce Motion.

The most clear approach for testing is to backup the phone to a computer and do a Factory Reset without loading the backup to get a benchmark on your usage without any of the third party apps, then add them back one at a time. You always have your archived backup to restore the phone to exactly where it was. The other way is to work backward by removing the apps one at a time and compare the difference. The high battery usage apps and the ones that are showing Background Activity are a good place to start.

As noted already, the Instagram app has been a problem for most. Meta has provided 11 updates to the app over just the last month and apparently some of the updates resulted in better performance and others not so much. Even Google called out Meta for the battery drain with the app on Android phones.