Most people who install this program and use it once or twice will not see how it really works. The Windows Battery display only gives an estimate of TimeCharge left, and is not that accurate. Windows always starts out assuming tons of full charge life, and re-reads the battery charge and nosedives as the battery is used, but it's only guessing on actual time remaining. It has no idea what the original factory spec on your battery is, or it's current condition, etc.
After using Battery Bar for over a year now, I can see how much time I have remaining running on the Battery, or time to charge - accurate almost to the minute!
But this only happens over time as Battery Bar monitors real time, real world use. You can't install it and immediately expect miracles.
The other nice feature of Battery Bar is that it gives a very accurate full charge time estimate, and lifespan of the battery remaining. On an older notebook such as mine, I no longer get 3 hours of use, but rather 1:48 according to Battery Bar - and it's CORRECT! I also see that I have about 49 of usable life remaining in the battery before I need to purchase a new one.
If you use a notebook, use Battery Bar!
It gives more information than I would have expected, but I'm not really sure if it has any real usefulness. Does it really matter how fast my battery is draining? I can hover over the icon that Windows provides to determine how much time remains. It's not that it's a bad program, I just don't see a reason for it.
The software developer responded to this review on Apr 08, 2009:
The major difference is the way that time remaining is calculated. Windows s estimate constantly fluctuates. BatteryBar keeps historical usage data for your computer and battery, which allows it to provide a very precise time remaining estimate.
This gives a much more detailed readout on the state of the battery than the default Windows display. Worth a look.