Hi. I have updated my iPhone to iOS 7.1.2 and ever since, I've been experiencing an extreme battery drain. I tried all the tips from different forums and nothing seems to fix it. I have restored many times using iTunes, then turning off Bluetooth, LTE (or Cellular Data), email push, BAR, etc. I have also cleared everything on my iCloud, it is basically empty without the backup. I get a 1% drain for every minutes on Sleep Mode (even on Airplane Mode). Any suggestions on how to fix this? I am worried this would cause a damage to the battery.