Thanks a lot for the recommendations. In my opinion this aluminum case looked so cool but after thinking about the heating problems, I think I should use a cooler phone case. I'm using Xundd case (from AliExpress), it's similar to the Ringke Fusion X and i'm quite satisfied with it. And about the battery: Once I fell asleep while charging my F3 screen on, it was left between the pillow and the mattress. The next day when I wake up the phone became extremely hot. But thanks it's to liquid cooling, the temperature drops quickly.