Not using or enabled: No Wifi, No BT, No GPS, Battery Saver Mode, No Live Wallpaper, No Task Killer Apps, no other battery monitoring apps. Fully, 100% charged at 10AM, left for offsite meeting. Phone shut itself off with Dead battery about 2 PM. Pulled Battery, reinstalled, nothing... Plugged in phone when got back PC (USB) and just have a Solid Green LED, but can't get power back on. Did it DIE already?