In a Mac Book Pro laptop the battery status is displayed on the status bar available at the top right hand side of the Desktop and by default it displays the battery percentage.
Mac provides users with the option for changing the battery status. It allows users to change the battery status by time, percentage or only icon. To change the battery display information, click the battery icon and shows your desired option available under Show menu.
For example if you want to the battery status to show the time left for next recharge then click the battery icon on the status bar, then navigate to Show menu and select Time from the sub menu list. This would change the time left next to the battery icon as shown below.