Poor battery performance on iPhone 16 pro

Do you guys think that this is a defective unit?

No, but wondering why you are not connecting the power adapter to the phone at night and leaving it connected all night.....every night....as Apple recommends.

Are you following any of Apple’s recommendations for charging?

About Charge Limit and Optimized Battery Charging on iPhone - Apple Support

iPhone Battery and Performance - Apple Support

Batteries - Maximizing Performance - Apple

About the battery and performance of iPhone 11 and later - Apple Support

Apple Optimized Battery Charging

About Charge Limit and Optimized Battery Charging on iPhone - Apple Support

The battery charges relatively quickly up to 80% and then it rests. The battery is trickle charged very slowly over the next 6-8 hours up to 100%. So, you start every day with the battery at 100%. My battery easily makes it to the next night when I connect the phone to power supply again.

If you set an 80% limit, you have to charge the battery more often. But, even if you want to use the 80% limit or another limit, the battery is still charged up to 100% "occasionally". Apple does not define how often "occasionally" might be, but it was 3-4 times a month when I tried the limit setting.....which I now ignore.

It might take 7-10 days or so for Optimized Battery Charging to learn your routine.

I get much battery performance by ignoring the charge limit, but your results may vary.

It is impossible to overcharge the battery, if that might be what you are thinking

Please show the apps that are using your battery and their corresponding background activity for last 10 days. Here’s mine. Please the background activity listed for those apps running in background.

And, we provided you with answers to improve on the performance of the battery.

Optimized Battery Charging works much better for me than the other options. It will take a few weeks for you to notice the improvement.

Otherwise, contact Apple Support and ask them to run a remote diagnostic on the battery. Expect a determination that "everything looks good".

I ran into an issue once where Location Services was enabled for an app and it was constantly doing things "behind the scenes" and it killed my battery all too fast.

Good luck finding the problem.