iPhone 16 Pro overheats when charging

When you charge a battery, especially if you use fast charging, batteries naturally put out heat. It's called thermal resistance and is a natural byproduct of charging. Unless you are seeing a thermometer on your screen suggesting the phone cannot be used, your phone isn't overheating. You may however, see a message if you use Optimized Battery Charging, once the battery reaches 80% that charging will be paused until the battery cools and this is completely normal as we all get this now.

What is the exact "overheating" message that you see on the iPhone's screen when the battery is being charged?