Why is my brand new iPhone 15 Pro Max battery draining so fast?

If you follow the best practice of charging overnight, every night, with Optimized Charging enabled, the phone should not require charging during the day unless you are a very heavy user of cellular networking or interactive gaming. If it meets this objective it is operating normally.

Hello!

You can check your battery’s health by doing the following:

• Go to Settings

• Select Battery

• Select Battery Health

There are various ways that your battery will be drained more quickly

Features:

Always-On Display

Wireless Hotspot and Cellular Data (particularly 5G)

Using resource-heavy applications:

Photo / Video Editing

Camera

Gaming

Running multiple applications in the background.

I hope this was able to help you!

Please reply if you have any questions!

Have a good day!