This isn't a fix to improve battery life, it's just a method to get help your phone's software battery meter align with your battery's actual charge. First:Why You Would Need to Calibrate Your Battery As your battery ages, it can no longer hold as much charge as it did when you first took your phone out of the box. However, your phone's software (and that little battery indicator at the top of your screen) doesn't necessarily account for this. When there's a discrepancy between your phone's software-based battery meter and your battery's actual charge level, it can have some confusing results. Recalibrating your software battery meter is actually fairly simple, though it takes a bit of time. Proceed at your own risk. Use your phone until the battery dies. Wait until the screen turns off completely. Turn your phone back on. It will likely shut down again before it finishes booting, but the battery isn't completely dead yet. Repeat this proc...