Charger Alert shows your battery percentage in a number of places:
In the main screen when you open the app.
As an ongoing notification that you can view by swiping down or from the lock screen.
In a battery widget if you decide to add one to your home screen.
To always have the battery percentage displayed in the status bar at the top of your android device,
follow these three simple steps:
Go to your system Settings.
Select the Battery section.
Find the Battery percentage option and toggle the button on.
This will permanently show the battery percentage remaining in the status bar at the top of your android device.