iPhone 16 Pro Battery Drain Issue ios 18.1 1

Have you updated lately? Then the iPhone might be busy indexing and it gets better later

If that is not the case, please force restart your iPhone to see if the issues persist

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the side button.

If you recently bought this iPhone, that would probably explain it. When you first set up a new iPhone, certain tasks continue in the background including indexing that might affect battery life. You should only experience this increased battery drain for a few days before it goes back to normal.