Free (Pro version available)
Platform: Windows XP, Windows Vista
Number of downloads: 707
This is the software publisher's description.
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.
BatteryBar keeps historical data on your batteries as you use your laptop. That information is used to calculate a very accurate estimate of the time remaining on your laptop.
Windows reports a time remaining that's very simple and fluctuates wildly from moment to moment.
When you're running on battery, BatteryBar shows the percentage bar in green, yellow, or red, depending on how much battery power is remaining. The bar displays the time left on your battery in Hours:Minutes. When charging, the percentage bar is shown in blue to indicate charging, and the estimated time to full charge is shown. The bar turns black and shows "On A/C" when fully charged
Note that this is the Free version. There is an even more powerful Professional version available.