XBox One Controller Battery Indicator is a tray application that shows a battery indicator for an Xbox controller and gives a notification when the battery level drops to (almost) empty. It is a free and open source Xbox battery measurement application that's light on system resources, straightforward and easy to setup.
Here is a screenshot to illustrate the features and user interface of this application:
MSI Center
NirLauncher
RegCool
SteelSeries GG
System Information Tool