One guy is right being. If you are around a weak mobile signal the battery will work more. If you don't have lte in your area but or for some reason think its overreated. You can on your phone go to settings/more setting-under wireless and network/mobile network/network mode. And there you can change from cdma only or cdma/lte/evdo. Now someone told me it doesn't make that big of a different. But since I don't have lte in my area yet. And 4g is only in spots in my town. I just leave it on cdma only. And since there is wifi nearly everywhere you go now. I'm not that concerened. Even at work we have wifi and I'm able to listen to espn and other streaming radio all day. and be just below 70% at the end of the day. As mentioned before check your apps intervals. If you have multiple gmail accounts as me. YOu may need to go into google talk and sign out of your accounts there, facebook, twitter, any weather app, the list goes on an on depending what you use. I can get easily 2.5 days of light/moderate use at times. But I charge it every 2 days. I just use auto adjust on teh screen brightness. And just make sure I close any open apps that i know will chew data and kill my battery life.