Hello, it has been 1 month since I bought 14 Pro Max. I am the first owner, a friend and I bought it at the same time. However, my screen time is 6-7 hours only on Wi-Fi, but my friend's Wi-Fi uses Bluetooth 4G turned on and it is 11-12 hours. Moreover, we use the same iOS version. (My friend's battery brand is Sunwo, mine is Desay.) I didn't understand this, it was really starting to bother me. We contacted Apple and they say there is no problem with the normal device. We've spent so much money and these problems are happening to us. What action can I take to fix the battery problem? I'm thinking of downloading iOS from iTunes cleanly. Resetting the phone normally. Things like this came up. I don't know, can you help me?