15 Pro's battery issue

I switched from my 14 Pro max to 15 pro max. The charge goes fast and takes out exactly 1 day. And in the first 10 seconds of the song Nick Youre/sunroof at 15 pro max I hear a crackling sound from the speaker.

On average, you can expect to see up to a 1% drop in battery health for every 25 cycle charges. 310 cycles/25 = 12.4. Thus seeing your battery health drop to 89% with 310 cycles, would be completely within normal. 310 cycles is a LOT of cycles in 9 months, and the more you use and recharge your iPhone, the more battery health will decline.

I got my iPhone 15 Pro Max in September on launch day and I've only have 83 cycles 11 months. My health has dropped to 97% accordingly, which is exactly what I would expect. You are clearly a power user and you push your phone a lot harder than I do. The more you push, the more you charge, the faster Battery Health declines. It's battery physics.

You do NOT have a warranty issue at all. And no, Apple will NOT replace the battery under warranty, unless at 12 months, it has dipped to 80%, which is most unlikely. But when your battery does dip to 80%, it will then be time for you to pay Apple to replace the battery.