As for me. Monday to Friday.
One sim LTE slot(data transfer always on). 2nd floor with big windows.
Wi-fi always ON(connected only at home - 6-00 pm - 7-00 am). Wi-fi 5 GHz.
Social network, messengers. Few phone calls. Google maps.
No 3d games. 

Fully charged device is usually taken at 7-00 am.
50%(+-) left until 6-00 pm.

I've found guy with same 8000 pro. He uses last 7 Android.
almost 2 days on 1 full charge. 1,5 hours per day he plays 3d games.

It is time to rollback. Or send my device to service(if rollback will not help).

It will help. Using only data connection (1 sim, 1 sd card, no wifi/BT), 2 full days (8am-11pm) + part of day (4pm-12pm) + 34% left (20180522 version).

Aeron wrote:

It will help. Using only data connection (1 sim, 1 sd card, no wifi/BT), 2 full days (8am-11pm) + part of day (4pm-12pm) + 34% left (20180522 version).

Thx

On BV8000, battery life on Android 8 is way worse than on Android 7. That's one of the reasons (but not the only one) I decided to downgrade to Android 7.

I get around 2 days. Before I had up to 15 days with low usage, now maybe 2,5 if I'm lucky. So battery drains around 6 times as fast.

Still 8.0
No time to downgrade.
Sometimes battery is drained 70% with my standard day.
Admin, can you suggest battery monitor application which approved by the tech team?

belond wrote:

Still 8.0
No time to downgrade.
Sometimes battery is drained 70% with my standard day.
Admin, can you suggest battery monitor application which approved by the tech team?

I suggest the native Android Battery App.