Hello and welcome to Apple Support Communities Sunny_78,
I see that you're having some issue with your new iPhone. I can certainly understand your concern, and I'd be happy to look into this with you.
Let's start with battery life. I know that battery life is important on a device, so take a look at the articles below about the iPhone battery and it's performance. I've also included an article to help with maximizing battery life. You can do this by adjusting some of the settings as suggested within that article.
iPhone Battery and Performance
Maximizing Battery Life and Lifespan
Next, you mentioned something about feedback noise. Respond back with some additional information regarding this issue.
- When are you hearing this?
- Is it when you're on a phone call or FaceTime call?
- Does this happen if you connect headphones to your iPhone?
- If this is on a phone or FaceTime call, does it happen with a specific contact or contacts?
- Also, Which version of software are you currently using?
Thank you for using Apple Support Communities.