I've set up my iP4 as a New phone and did NOT restore from a previous backup. I did a full charge to 100%, reset the data usage and made sure all apps were closed. I put it the phone to sleep (clicked power button) and I went to sleep. I woke up this morning and woke the phone up; 4% was used after 6hrs and 50min of standby time, there was no other usage. Doing some quick math this would equate to 170.83 hours of standby time assuming a linear relationship; 56.94% of the 300hrs on the spec sheet. 410min/4% = 102.50min/% of standby use 102.5min*100/60 = 170.83 hours This seems pretty light given the standby time rating. I'm hoping I can get others to perform the same test to get a decent sample of performance, please post your findings. Thanks!