Same for me. Never heard back from anyone as to why the GS5 was so bad on battery life so I returned it. Now have an M8 that lasts for day and half, and I am liking it much better for things other than just the amazing battery life. Saved some money by returning the Samsung Gear as well. Wish it worked with other devices though. Maybe someone will figure out the GS5 and make it possible to get more than 4 hours battery. Till then, I am about done with Samsung. Too many bad experiences. Sold my Note 3 because it had no GPS, even after update. Galaxy S4 was extremely choppy and ridiculously slow with interaction in email and texts. HTC seems to be the best device out there, if only I could get my hands on an Xperia Z2.