powertop output is absolutely OK, no unexpected wakes from kernel, etc.

Fabry, could You open my tutorial for measuring battery capacity (it's in my signature), grab bq27200.sh script posted there (You may ignore everything else written there, if You wish), put it in your device, ensure, that You have i2c-tools installed, and finally, run it in loop, via:

...On idle device, with everything (including GSM) turned off. Then, lock the screen, and put phone to rest for 5 min, with script running in background. After this, copy and paste here last 15-20 lines, OK?

Normal result for idle device, with script like bq27200.sh looping every 5 seconds, is 20-25 mA current detected. We will see, if Your current usage is higher.

/Estel