BatteryBar is a simple, straight-forward, battery meter that monitors the status of your battery and displays your battery’s status in the taskbar.
BatteryBar constantly monitors the status of your battery as you use your laptop. 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.
Licence :- Freeware
Homepage :- http://osirisdevelopment.com