I went to bed at 11pm last night with 53%, woke up at 7am with 45%. I use AOD, so it went down 1% per hour as advertised. I do have Wifi set to shut off when the phone is locked and asleep, so that helps too. I have location services always on too. One thing I found that I did different than any Android phone I have had before is I did not restore this phone from another device. I set it up as new and I am glad I did. This is the best battery life I have had with an Samsung device. I regularly get 35-40 hours on a charge with 4-5 hours SOT, and I am a heavy user at times.