Installing and using Coconut Battery for checking battery life remaining is probably the easiest and least hassle method of seeing a battery life estimate on a Mac laptop that has had the feature removed with 10.12.2 update and remains removed in latter updates.
Once you launch Coconut Battery, go to the apps preferences to enable it to load on login and to enable the menu bar item, where you will be able to see battery time remaining.
If you plan ahead of time, you can simply copy the file yourself from the following location: Locate the “Battery.menu” file from 10.12.1 or earlier and make a copy of it to your desktop or elsewhere easy to find.
After updating to Mac OS 10.12.2, you will then restore your just backed up version of “Battery.menu” back into the /Menu Extras/ directory.
This one is a bit more advanced and involves mucking around in the system folder.
It’s also trickier because you must have the file from Mac OS 10.12.1 or earlier after you have updated to 10.12.2, 10.12.3, 10.12.4 etc.
The most obvious one is your computer randomly shutting off and dying before the battery percentage hits zero percent or even gets low.
The more modern versions of Coconut Battery also offer an optional battery menu which you can use to see the battery time remaining on any Mac Book, Mac Book Pro, or Mac Book Air.
You should basically just use your computer like you normally do, except let the battery show off every bit of its power.
First, plug in your Mac to a power source and charge it to full capacity, 100 percent.
Apple has removed the battery time indicator from Mac OS Sierra 10.12.2, meaning if you install the update on a Mac Book Pro, Mac Book, or Mac Book Air, you will no longer get a battery life remaining estimate from the battery menu.
Given that Mac laptops are inherently mobile and battery dependent, many users like to have a general idea of how much battery time is remaining, even if it’s not 100% accurate, and thus are understandably not too enthusiastic about removing such a feature.
After fully charged, leave it plugged in for about two hours so it sits at a 100-percent charge.