Battery life is far better in ICS, I have checked the uses of battery by applications...nothing seems suspicious....battery is lasting more than 12Hr that's less, but I am doing too much R&D as I am new to it...I haven't installed any useless apps..just whatsApp using rarely..data network in on 24x7, no email sync.BTW how to factory reset the camera? In Day light its good(not too good) but at office in CFL light with flash , it seems there is no flash used at all. Using full resolution and antishake on, tried auto contrast too. During taking the picture..in screen its looking too good, but after capturing...half of the contrast and brightness gone.hehe..I think I am demanding too much from S2.