What is battery calibration?
The Android operating system needs to keeps track of your battery and charge levels so that it tells you when it is full or empty. The problem is that it sometimes becomes corrupted and starts displaying data that isn’t real, which, for example, causes the phone to turn off before it reaches 0 percent. This discrepancy in data can also be caused by aging.
All batteries degrade over time, and an older battery can no longer hold as much charge as it did when it was new. However, the software your phone runs do not usually take this degradation into account while displaying the battery status on the screen.
Calibrating your Android battery simply means getting the Android OS to correct this information, so it is reflective of your actual battery levels once again. It's important to understand that this process does not actually calibrate (or improve) the battery itself. Nor does battery calibration improve the battery life of your phone. It will only help the phone accurately display battery stats.
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