Does anyone also purchased a new iphone 15 recently? The battery seems to drain quite quickly right? Not sure if you guys feel so too.. thinking to bring to apple store to check

Hmm... I recently bought the iPhone 15. I've got the 15 Pro. And everything's great, the battery lasts forever. Sorry, but it looks like you're having some issues. Taking your iPhone to a service center or an Apple Store, like you mentioned, is definitely the best way to go. But you can also try various tips and tricks from the internet. My friend had the opposite problem, where his iPhone suddenly stopped charging for some reason. Can you believe it? He tried all the methods from this article https://setapp.com/how-to/fix-iphone-not-charging. And the cause for him turned out to be the last one listed. Amazing luck and patience. I guess he really didn't want to take the phone to the service center and pay for potential repairs.

You can try to turn off the apps background refresh, the always on display, and turn down the 120Hz screen refresh rate to 60Hz. To me, these features are not crucial. If you dont mind using the phone in this state, changing these settings will help to save you battery.