If you want more battery life, I'd pay attention to screen brightness and background apps. Also startup apps can cause battery drain. The bootmanager xposed module should help with that. You can also try amplify xposed module to help with wakelocks. Otherwise I'd use xperion ROM + freedom kernel if you want the most battery life. It's more efficient than this. This rom with the overclock kernel is geared more towards speed and smoothness since this phone's battery is already huge for it's low power consumption by default.