Here's one of the first things you should look into when you have upgraded your old phone to the latest One UI7. A lot of people complain at first of battery drain. This is absolutely normal. Your phones new UI has began its skill of adaptation. You can help it along the way with many settings. Here's just one many overlook.
Find the device care app. Should be under Samsung Apps
Open device care and look down screen for performance profile and open that.
Here you are given the options to choose between standard and light. By choosing light, you won't notice much, if any change to your phones performance. But you will notice a marked difference in the heat and battery life of your phone.
This is just one simple setting to start your journey on letting One UI 7 do what it does best. And that's adapt.
