WMMiniBattery is a free and simple battery meter application for Windows Mobile Professional devices that will always show you how much battery power you have left.

The usage is very simple, after installing to Device, you can start the application by the icon from Programs. WMMiniBattery will place a three pixel wide status bar on the very top of your screen that will be a graphical representation of how much power there is in your battery. This bar will stay on top of all windows so you can easily read and access it from anywhere. Tapping the bar will bring up a small window with additional information, such as power percent, temperature, voltage, amperage, type, etc. From here you can also set it to automatically load at startup.