Near the halfway December last year, Apple has released an update very important for MacOS Sierra. In addition to bugs resolved and improvements made to MacOS Sierra 10.12.2, Apple decided to eliminate battery charge indicatorWhen the MacBook is not connected to a power source.
So people using the battery remaining time indicator (Battery Time Remaining) From the menu bar, you will not be able to enjoy this function.
We don't know exactly why Apple decided to give up this option. It is speculated that the hardware of the new MacBook models would no longer allow the battery life time to be reported.
It is true that this report does not have the autonomy 100% accuracy, but users could get an idea of their working time remained available.
After this option was eliminated from battery status, There are a number of applications for MacOS to show the remaining time of the battery. A simpler solution is to see "Battery Time Remaining" in Activiry Monitor application that is present on all MacOS.
As we can see Battery Time Remaining in Sierra MacOS
All you have to do is to open utility Activity Monitor and go to the tab "Energy"
In the bottom of a utility to see the battery status. Percentage of energy left, time left and how long is running on battery.
For this tutorial I used a MacBook Pro (mid. 2012) with MacOS Sierra 10.12.2 is as you learn Battery Remaining time on the MacBook Air or MacBook.