A cousin from the United States is going to sell me a 128GB iPhone 12 Pro for 230 USD, the battery has been changed but the cell phone in repairs is branded as second-hand, it cost him 80 USD, I don't know what quality it is, I want this cell phone as a secondary cell phone since I have an S24 Ultra as a primary cell phone and I want something to start iOS and see if I really like it without risking changing my main cell phone, is it still a good option in 2025? That it lasts about 5 to 6 hours of SOT would be enough as a secondary cell phone in my opinion but I don't know how good that battery is, it went from 41 to 37 after a good while of use but it stayed stuck at 41 for a while and then went down to 37, it seems that it is out of calibration so I don't know if I should calibrate it since it only sent it to me after changing it, suggestions?

I know that the US version can mute the photo sound and has that extra mm wave receiver cutout on the side but is that it? Do the units in Korea have other differences?