Hello! Up until today my iPhone 5 has gotten really good battery life for being two years old. I can usually go from the time I wake up until I go to bed without charging. I normally leave Bluetooth and Background App Refresh turned off. Yesterday I bought a Fitbit Flex used. In order to use it correctly, I obviously need Bluetooth and Background App Refresh turned on. For BAR I've turned off all other apps. Any suggestions for how to maintain the good battery life I had? I'd like to be able to use the Fitbit and app the way they're intended, but having my phone die around dinner time when it used to go until bedtime is rather inconvenient. Thanks!