As soon as I activate Bluetooth it seems to drain a lot of energy from the battery.
GSam Battery Monitor show a energy consumption around 89% only from Bluetooth (if activated).
I think I had already issues with Bluetooth on Android 7.1, could this be a driver issue?
But at all I cant let Bluetooth activated, e.g. to keep sync with my Mi Band 2. Only way is to activate Bluetooth just for a short time to sync data and deactivate it afterwards...