Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3) If I leave Facebook logged in all the time will it kill the battery? And also do you think it's possible that my mophie case is draining my battery when it's turned off? At 5%battery I have 5hours and 41 mins of usage and 9 hours and 54 mins of standby. I have the 32gb s4. And the last update has made my battery usage even worse. What can I do short of turning everything on the "smart phone" off?