>If your phone is iPhone 6s, then you should check your phone is eligible for replacement or not.
>밧데리도 이베이에서 사서 바꿔도 보았고
He has already crack opened the phone. Apple won’t do it for him.
I wouldn’t buy phone batteries from eBay sellers. I did a couple of time and they all died much sooner than expected. Nowadays I exclusively order replacement batteries from ifixit.