Battery health drops 5% in a month

Hi Malikbilalejaz

Welcome to the Apple Community.

Wondering if you might want to update to iOS 15.2

Re: "really worry about this issue"

It may be not worth the worrying ... What is the worst that can happen ?

Battery replacement ? ... maybe $0 .... or, if / when it becomes necessary up to $69 US

Details: https://support.apple.com/iphone/repair/service/battery-power

In the meantime:

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Re: Battery health

Apple support have articles online that may help.

About the battery and performance of iPhone 11 and later

https://support.apple.com/en-us/HT210557

iPhone Battery and Performance

https://support.apple.com/en-au/HT208387

Monitor the iPhone battery level:

https://support.apple.com/en-au/guide/iphone/iph4747a74a9/ios

Tips about maximizing battery life and lifespan:

https://www.apphttps://support.apple.com/en-us/HT210512

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Apple support also have articles about charging, that may be helpful..

About charging the battery

Eg: You can scroll to "Turn on Low Power Mode"

https://support.apple.com/en-au/guide/iphone/iph63eecc618/ios

More About Optimized Battery Charging on your iPhone

https://support.apple.com/en-us/HT210512

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You can always talk to someone at Apple about the battery issue,

and especially if you have Apple Care / or / device under Warranty.

Apple do want people to be happy with their products,

There is a "Get Support" link to Apple at top right on this discussion page.

Or

You might visit an Apple Store: a Genius Bar reservation is recommended:

How to make a Genius Bar reservation at your favourite Apple Store, and get help from an Apple expert.

Genius Bar Reservation and Apple Support Options - Apple

Or

From iOS device you can use the app to easily make an online Genius Bar appointment: 

https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8

Or

Apple phone numbers around the world

Contact Apple for support and service:

https://support.apple.com/en-us/HT201232

All the best :=)

Thank you for your reply, Malikbilalejaz, and for letting us know.

We are all Apple users, like yourself, in this community.

If you want to send feedback to Apple, there is a webpage available:

If enough people send feedback on a concern, it could well be addressed in an upcoming update.

Product Feedback

https://www.apple.com/feedback/

All the best :-)

If you bought it used, then you might not have all the history. The battery health number is an estimate, and one that doesn’t recalibrate on a daily basis. I’ve seen my battery health displayed at 100% to 99% for about one year, then drop to 95% quickly. But it was still doing OK with over 200 cycles. But it could have been holding off on the update for some time before you had it.

How many cycles does it have. Apple can access through its diagnostics. There are also some tools that can check it, including coconutBattery for Mac.

To understand how your battery works so you can get the most out of it:

Why Lithium-ion?

https://www.apple.com/batteries/why-lithium-ion/