Microsoft is testing a battery percentage icon for the taskbar in Windows 11, with no confirmed release date. Users can currently use alternative applications like Battery Bar to display battery levels. Battery Bar allows users to position the battery icon and percentage on their screen, with specific installation steps for Windows 11. For Windows 10, it can be installed on the taskbar with limited customization. Other applications, such as Battery Percentage Icon from the Microsoft Store, also provide battery percentage display but may have startup issues on Windows 11.