Actually, Niklas, in your first example, turning off Bluetooth from the “Control Center” like that doesn’t turn it off (ironically). It just shuts off any currently connected device. You need to fully turn off Bluetooth AND WiFi from within the native Settings app. Go see for yourself. If you have had Bluetooth and/or wireless on, and turn them “off” from the “Control Center”, then navigate to Settings and see that they are, in fact, still ON and still draining your battery.