BatteryBar is a simple, straight-forward, battery meter that monitors the status of your battery and displays it in the taskbar.
As it monitors your battery, it keeps historical data on your battery and provide you with a very accurate estimate of how much time is remaining on your battery. The program has statistical time prediction. Always-on battery icon shows current battery status. You also can create a discharge/recharge profile of your battery and determine "time remaining" based on historical usage profile of your battery.
The application provides you with the automatic upgrade notification popup for the latest stable release too.