iPhone 16 Plus battery draining fast with latest update of iOS 18

I charge mine overnight, every night, and at the end of the day it is usually still at 50% capacity. But what are you doing with it? Interactive games? Watching videos (especially streamed)? Are you connected to Wi-Fi or cellular data (which uses a lot of energy).

When you go to Settings/Battery what are the apps using the most energy?

And very basic, have you tried restarting your iPhone→Restart your iPhone - Apple Support

"iPhone 16 Plus battery draining fast with latest update of iOS 18: Why is my phone battery? Draining faster with this new update? Of iOS I charging my phone now 3 times a day I have the newest model iPhone 16 Plus"

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Report this to Apple...

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of this, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread
4. Proceed from there as necessary

Troubleshooting a Draining iPhone Battery:

Any notification messages popping up, or other messages, that are relevant to battery and power?

A. Battery Drain Info:

The iPhone battery will drain, unless it is plugged in and charging. With lots installed, the charge would be slower. As for how fast it would drain the battery, that would depend on the battery health and the volume (sound) you use.

1. Go Here: iPhone Battery and Performance - Apple Support
2. Scroll Down: to "Your battery's maximum capacity"

B. Verify the Batery Health Percentage:

Apple recommends you get a new battery, once the Battery Health reaches 80% or lower. When the Battery Health is 80% or lower, it is time for a new battery. Unfortunately, these if no way to know how, nor when, then percentage decrease occurred. So see if it tine for a new battery...

1. Go To: Settings
2. Tap: Battery
3. Tap: Battery Health
4. View: [the percentage]
5. Is it 80% or less?  If so, it is time for a new battery.

C. Troubleshooting the Battery:

• iPhone Battery and Performance - Apple Support

• Charge and Monitor the iPhone Battery - Apple Support

• About the Battery Usage on your iPhone - Apple Support

• About Optimized Battery Charging on your iPhone - Apple Support

• If you see "Your iPhone Battery may Need to be Serviced" - Apple Support

• Use Low Power Mode to Save Battery Life on your iPhone - Apple Support