missing battery time remaining estimation

In the post Power meter missing remaining battery time, a Microsoft Forum Moderator answers :

Microsoft has removed this feature because the time left meter is not accurate. The time left is estimated depending on the current load on your PC, and time left changes when your close/open an app, adjust brightness, increase/decrease volume, etc.

This is born out by the large number of posts one can find on the Internet dealing with this same problem. Many users share this problem, but no solution was ever found.

I do agree with the above text, since I also have learned to mistrust the remaining battery time on my Windows tablet.

Why this change has not propagated to the SP4 is a mystery, but it is possible that because of some hardware differences Windows Update has decided that this particular update does not fit your device.

See this answer for seeing how complicated is the decision by Windows Update on which updates to install and in what order, to understand why not all updates arrive on all devices.

You will have to wait to see if the number of complaints will motivate Microsoft to return this feature. Microsoft is not known for going back on such decisions, and all that one can hope is that this was only an unintended side-effect that will be fixed in the future.

As strongly suspected and concluded in the Q and comments:

after adding:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power]
"EnergyEstimationDisabled"=dword:00000000

and optionally deleting the keys

UserBatteryDischargeEstimator 

EnergyEstimationEnabled 

the missing remaining time estimation is finally back after a reboot!

edit:

semi annual windows updates are obviously reverting these changes. You have to reapply the changes after 1803 to get back you battery time estimation!