The thing that helped me with drain issue was to put the phone to 3G in Preferred network type. OS 2.6, bought the phone one month ago and immediately updated to newest version.
In the first days i did not have over 1 hour of SoT with full charge, so I put the sim back to old phone… I then saw that battery is not draining so fast.
Putting the phone to use only 3G did solve drain issue for me, so I hope this will be addressed in OS 3. And maybe this will help others.
