After tried every settings to increase battery life (even Xposed + Amplify to disable all unnecessary wakelock), the best I can get is the phone still draining 0.5%/h during idle overnight (it should be 0.0%/h like I did same settings with my old phone Flash Plus). So I did some test and found that bug Wi-fi keep turning on during screen off that cause battery draining even phone sleep.
I've tested with firmware V3.6, also flashed back to firmware V3.2 and still have same bug with follow steps:
- Flash to stock firmware.
- Reset factory settings.
- Install BetterBatteryStats: https://play.google.com/store/apps/details?id=com.asksven.betterbatterystats
- Go to Settings -> Wi-Fi -> Advanced, set Keep Wi-fi on during sleep to Never
Hope in next firmware version can fix this battery drain bug.