NickSoul , via OnePlus 9 Pro Morning Mist , Jun 12, 2021 : Since I see many people complaining about this topic, in this thread I would like to share our experience about the OnePlus 9 series battery drain issue. In my point of view , battery drain on my 9pro 128gb seems really awful. Currently I am on oxygen 220.127.116.11 which was supposed to fix the battery drain issues but it seems to be worse. Every day I am getting about 3-4 max screen on time, with 120hz 1080p settings and around 40% screen brightness. Data or wifi always off except when I am using the phone. So I am wondering... I paid 950 euros to challenge myself not to use my phone in order to get me around a day of usage? OnePlus you should better do something for this.