Near the halfway December last year, Apple has released an update very important for MacOS Sierra. Besides the bugs fixed and the improvements made in 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, a series of macOS applications have appeared that show the remaining battery time. A simpler solution is to see "Battery Time Remaining" in the Activiry Monitor application, which is present on all macOS operating systems.
As we can see Battery Time Remaining in Sierra MacOS
All you have to do is to open utility Activity Monitor and let's 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.