iPhone 12 battery drain and battery health issue

I purchased iPhone 12 128gb last year on 18 October 2021, my current battery health is 89% and I am facing these following issues :-

1) Now after 8-9 month my iphone 12 battery is draining very fast. In just 5-6 minutes of normal social media scrolling like Instagram and Facebook leads to 2-4% battery drop and in 10 minutes of usage it lead to 6-8% battery drain which I think it's normal because social media scrolling not drain this much battery.

2) One major issue that I am facing right now is camera battery drain issue. 5 minutes of using camera lead toh 4-5% battery drain. Just 1-2 minute of camera usage lead toh 1% battery drain and when I use it for 10 minutes battery drained is 9-10%. Usually now my battery drain by 1% when I am using camera for 1-2minutes.

3) Let's talk about battery charging! Usually I charge at night, and my battery don't get down from 30%. I charge upto 95%-97%.

4) Now lets talk about screen time. I use my phone for 3-4hours. To check my battery I did one test. One day I used my phone for 4hrs in which I didn't played game and didn't used camera also in just 4hr. my battery came to 45% from 96%. I think my battery draining is very quick. Then I did one more test to check more , in this test I used my phone just for 1hr 35min and then also I drained 30-35% battery, I noticed when my phone screen was off I mean when I was not using my phone then also my battery was draining by 3-5% in 1hr. Let's talk about gaming I usually play PUBG , 36-44% battery is drained when I play game for 1hour only. So it's also a serious issue! And while watching YouTube video for 1 hour 18-25% battery is drained. This is also not a good sign.

5) My battery health was 93% three months ago but after updating to iOS 15.5 my battery health dropped very fast. I have given the dates of battery health drop!

May 12 / 92%

May 24 / 91%

May 30 / 90%

June 18 / 89%

Now the battery health didn't decreased, it's been 20days since by battery health is not decreased from 89%, and this is why now for saving battery health I have 4 reduced my screen time toh 2hours-2.5hours which was earlier 5-6hours.

I hope now you are aware of my phone issues. My phone is in warranty so I can go to Apple Service Centre and can replace my battery also. What you think should I go to service centre.

This is it! Thanks for reading this whole issue! If you have any advice and wants to say something then please reply to my comment!

IMPORTANT POINT :-

This all issues I started facing when I updated my iPhone to iOS 15.5 !