Why does my new iPhone 16 Pro Max heat up while charging with the original charger?

After you setup your iPhone, it has many background tasks to run including indexing, which is creating and sorting a searchable database of your data. Indexing is best performed when the iPhone is on the charger, so it can work extra hard during that.

It's also normal for your iPhone to exert heat when charging. If your iPhone were overheating at a dangerous level, it would display a Charging on Hold message and pause charging until it cooled down. You may also see that your iPhone may pause charging at 80% to cool down before it continues to 100%, as heat is not good for battery health longevity.

New iPhones have a considerable amount of data to sync and backup. iPhone 16 models have Apple Intelligence and for the first few days AI is indexing a large amount of data in the background.

Heat is a normal byproduct of the activities, charging etc. Your device has internal mechanisms to protect the device against overheating. In other words, your iPhone will stop activities and charging before any internal components are damaged.

roshanb852 wrote:

Okay! Thank you for the knowledge!

You're very welcome! You may see during this setup period that the iPhone's heat will be more noticeable, but it should go down in a few days.

You’re welcome and I hope you have a great weekend!