why my iphone 8 had a bug after update the ios 16 version?

DJoward wrote:

My iphone 8 has a bug, it so fast to get lowbat and etc.

An original battery has quite possibly been exhausted and needs replacement.

What is the current battery health?

Settings > Battery > Battery Health & Charging

80% or lower is headed for replacement.

DJoward Said:

"why my iphone 8 had a bug after update the ios 16 version?: My iphone 8 has a bug, it so fast to get lowbat and etc."

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Troubleshooting iPhone Battery Draining:

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.. 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

C. Did this Occur After an Update?:

Give Apple Feedback:

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.

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 post
4. Proceed from there as necessary