Battery Calibration is an awesome app that fixes common battery problems.
*PLEASE READ HERE FOR MORE INFO!*
Installed a new ROM? Or does your battery seem to be gone and drains very quickly? There's an easy help for this!
Battery Calibration is a simple app that formats the batterystats.bin file located in your /system storage.
This app removes the old values. After some time, your system will generate new, updated values.