hi, I have a Samsung Galaxy S2, the battery drainage was ok when I was using ICS 4.03 (overnight, 4~5% battery drain).. but after I upgraded to 4.04, the problem came, the battery drainage overnight is immense (from full charge to around 70%).. I installed CPUSPY and noticed that the CPU was no longer in "Deep Sleep" mode like it was in the ICS 4.03, but stayed at 200MHz, and my phone was kept awake for the whole period. I tried a hard reset on the phone, but the problem did not go away...