The battery is working fine at this moment.
Yesterday afternoon (4.00 PM Italian Time Zone) I do a full charge and I used my phone for playing mp3 for more or less two hours I browsed some internet pages in 3G (on a Bus while I was travelling for more or less 110 km) and I used the wlan connection for the rest of the time until now... and after 23 hours I have yet the 48% of my battery.
So my first impression about battery draining was wrong.
I use the last nightly build but I prefer to use another RIL (the HTC-RIL 2.2.0028HM) and the 32.56.00.32U_5.17.05.23 Radio version.
The governor I use is Interactive (245-1113 MHz).
I hope that my data could be useful for other users.