My battery percentage is decreasing weekly and I don’t know why?

Mathewstani Said:

"My battery percentage is decreasing weekly and I don’t know why?L My battery percentage is decreasing everyday."

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Troubleshooting iPhone Battery Draining:

Refer to the Following:

I. Upgrade Once More:

Upgrade to the latest update.

Go Here:  Update your iPhone Using a Computer - User Tip

II. Report this to Apple:

Do your part: Let Apple know what is going on here. Provide them with feedback on this. They may not get back to you directly, but the more feedback they received on this, the more they will know what is going on, and what needs to be fixed in updates to come.

1. Go Here: Feedback - iPhone - Apple
2. Comment: on when the issue began, and how you have troubleshot it thus far.
3. Select: "Bug Report" for the "Feedback Type"
4. Proceed from there aw necessary

II. Troubleshooting iPhone Battery Draining:

Refer to the Following...

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

iPhone 11 and later models, battery performance --> About the battery and performance of iPhone 11 and later