I have installed GrapheneOs for 1 week. I installed AccuBattery to track the battery life. Before, using native os I got estimated battery life as 9hr28m. Now, after using GrapheneOS, my estimated battery is down 1 hr to 8hr28m. Moreover, the device becomes much warmer than before. Using Antutu battery thermal check, it increase from 27 degree C to 34 degree C. I could not track where the issues coming from.