I am new to the Nexus and I am extremely disappointed in its performance with battery life. I took it off the charge 30 minutes ago and have already lost 10%. I have taken the screen brightness down, turned off NFC, screen timeout is 30 seconds, turned 4G off along with WiFi and bluetooth. I dont know what else to do.. Will 4.0.3 fix battery issues? Any tips or info are greatly appreciated.