iPhone 16 Pro Max's battery dropped from 80% to 55% in just one hour

I agree with stedman that it looks normal especially for a new iPhone. I think we should revisit this in several weeks when usage patterns are more established and background activities a new iPhone does are over. But, again, looks normal to me.

You could have adjusted things like turning off Background App Refresh for apps that you don’t need it running (such as Facebook) first to see if they helped versus deleting. If you tend to get a lot of notifications from Facebook you could turn that off unless you just absolutely need to get the notifications for every action. Also, I doubt that most of us upgraded for the “powerful battery” unless they were coming from an older iPhone that had lower battery life even when new. I personally have not had any issues with my battery nor have I had to delete anything. I always check my settings when getting a new device or updating to a new major iOS just to be sure things are still at the best options for my use. Going through yours may actually be a good idea

I believe your observations are accurate, but I also believe there may be underlying conditions that you’re not aware of and therefore not reporting.

I have an iPhone 16 Pro Max and this could be the best iPhone battery I’ve ever had.

Let’s see your last 10 days of battery performance and which apps are consuming your daily battery capacity.

How new is your iPhone?

Your screenshot appears to show a drop of approximately 25% in about 7 hours. If there was usage during that timeframe, that would seem normal.