Its simple 865 Is one of the new 5G prosessor at that time and not optimised for 5G usage at very high speeds if your using 5G with network connectivity then the battery usage and heating will be the problem but 4G just works fine no heating and high battery drainage im still not satisfied with the battery backup Also im a root user so i tried different ROM / OS on S20 fe 5g the ittue is with the hardware its nothing to do with software and optimisation only way to save battery is to underclock the prosessor which i do oftenly it deos slows down the device but it works for me fine for moderate usage
Addition: Im outperforming some Sd 870 Divices with antutu scores over 850k +
