I managed to nail down getting the phone to enter deep sleep without being interrupted.
Went to sleep last night at 99% unplugged and when I almost 8 hours later, it stayed at 99%. (0.1% / hour)
I'm also a fairly heavy user browsing throughout the day and I get over 6 hours of screen on time consistently.
- Non-LTE version
- Wifi GPS on
- Apex Launcher
- I don't use any SNS so I've disabled every SNS related process (Twitter, Facebook mainly) and also disabled Chrome since I heard that they drain battery quite a lot (I use Boat browser).
- Disabled Sony bloatwares such as the Sony Lounge, Sony Select etc but rest were untouched.
For the first 4 days of using the phone I charged overnight to 100% till right down at least 5% before going to sleep and I think that helped calibrating the battery life as I've noticed my screen on time increased by around 30 minutes each day. I only used to get 4 hours of screen on time at first now I get 6.