Stefan, after upgrading to OTA-9 I had a quick battery drain overnight once. Something like that happened many OTA releases ago as well and was related to some kind of stuck background process (there is a bug report for it and it should be fixed). A clean reboot solved it back then and also now. With wifi, gps and bluetooth off, I charge my OTA-9 MX4 maybe once per week, which I think is ok.
Stefan, after upgrading to OTA-9 I had a quick battery drain overnight once. Something like that happened many OTA releases ago as well and was related to some kind of stuck background process (there is a bug report for it and it should be fixed). A clean reboot solved it back then and also now. With wifi, gps and bluetooth off, I charge my OTA-9 MX4 maybe once per week, which I think is ok.