So you’re using your phone or tablet and all of the sudden it switches off. There was no battery warning from Android—in fact you recently checked and Android said you had 20% battery power left. What’s going on?

Even if you treat your mobile/tablet battery properly its capacity will decrease over time. The built-in power meter (aka fuel gauge) estimates how much juice available and how much time left for your battery but these estimates can be sometimes incorrect.

The app will try to reset the power meter of your battery it will work with any device having root permissions otherwise it won't work.. Your device should be fully charged before you tap the Calibrate button.

If your problem hasn't been fixed then it might be your battery is dying and need replacement. If you have any question let us hear from you :)