I just must use my phone ti much. I never tried to see how long it lasts with light usage. I can get about 6hrs with heavy use tho. If im lucky. Sometimes I only get 3hrs but I think that depends on my signal. I get more battery time when im using wifi, cuz my signal at my house is horrific
Signal is huge battery killer. If you are almost roaming all the time the phone will constantly boost the amount of power used for the cell connection draining the battery like mad. I was in an area with no service and it killed my battery quickly. It's like leaving your phone active while in flight.