One of the most annoying things about owning a Pocket PC is that the battery has a tendancy to die on you at the most critical moment. Luckily, there are plenty of apps out there that can make it easier to manage the power on your device, and Batti is one of the best I've come across of late. The freeware points out a lot of detailed information about your battery status, including the remaining capacity, tension strength and even the temperature.
Once installed, Batti displays a battery symbol at the top of the screen. By clicking on the icon you can bring up the data on its status. The program can be set to warn of you of impending battery failure either visually or in the form of an acoustic tone. As a result, Batti makes for an ideal way to ensure you're never caught short due to a lack of juice.