@dda OK, thanks for the information.
The phone is "useless", I am afraid of degrading the battery (I found it off three times); I have changed the SIM card to other phone whit other OS, unfortunately.
Without data connection (only WiFi), GSM and use : - 20% in 19h. Now I am testing in Fly Mode, It seems that consumption is normal: -1% in 5h. Tomorrow I will test with GSM only, without data connection and WiFi, and I will recalibrate the battery in the next cycle.
I do not think it's a problem with Legacy Devices; I read the same problem with Nexus 5: Battery drain much too high
@marathon2422 I don't have a SD card inserted.