How to show the battery percentage on your Mac computer and customize your settings to save battery

Displaying the battery percentage of your Mac in the top menu bar can be helpful for managing your battery power.
AP
You can show the battery percentage on your Mac computer to help track exactly how much battery life you have left, and when you need to plug it in. 
To turn on the battery percentage display, open the "Energy Saver" tab of System Preferences. 
From the Energy Saver menu, you can also see the current health of your battery — in other words, how much of a