Do you have a laptop, are you running Windows 7, and most of all, does your battery seem like its running low faster than it should be?  If so perhaps running the following command from the command prompt will give you more information about what’s going on:

powercfg -energy

This will run for about 1 minute, more on a slower system. The report will be placed in the following location: C:Windowssystem32energy-report.html

– jermal