I found that when I disabled the 4G and went to Wifi only my battery didn't drain as fast. I've also read other people say that when they are on 3G, CDMA only mode, that the device battery is dramatically improved. Only problem is when I go into the settings to switch Verizon only gives Global, LTE/CDMA, and GSM/UTS modes but no CDMA only mode like Sprint. Any ideas?