One of the things I have noticed about my new phone is that when I leave for work I have to make sure and turn WiFi off as well as Bluetooth if I’m not using GPS. I don’t use a Bluetooth headset so that becomes unnecessary unless I am going somewhere I haven’t been before. Samsung supplies a normal battery as well as an extended lithium battery for the i760 and it’s a good darn thing but even with the extended battery, as I discovered last week, if WiFi and Bluetooth are both left on all day it can seriously drain the thing. I finally started carrying the extra normal battery with me just in case.