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Monitor your Mac notebook computer’s battery
If you use a Mac notebook, you can show the battery’s charge level in the menu bar.
Show the battery’s status in the menu bar
On your Mac, choose Apple menu
Select “Show battery status in menu bar.”
Show the percentage of battery charge in the menu bar
On your Mac, choose Apple menu
Click Battery, then select “Show Percentage.”
See how much time it will take to charge the battery
Connect your Mac to a power supply, then click the battery icon
in the menu bar. The estimated amount of time that it will take to fully charge the battery is shown at the top of the menu.