Regardless of the make and model of your Android-powered smartphone, you most definitely were advised at one point in your life to delete the “batterystats.bin” file, aka wipe your battery stats. That is, of course, if you are the techy user.
According to those who tell you that, deleting that certain file (possible via Recovery) will make the phone forget the previous charging level, allowing you to “recalibrate the battery”. According to Dianne Hackborn, Android Framework Engineer, this is just a myth.
Those in favor of “wiping battery stats” say that the file referred to above will hold information about charging levels. The discussion usually pops up in scenarios in which battery lasts shorter than usual or a full charge is reported when the battery is practically not 100%. Believers say that if your phone reports a full charge at a real 92% for instance, deleting that “batterystats.bin” will get you back on track.
The Android Framework Engineer says that the following statement is false: “The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory”. According to Hackborn, the file usually holds the information related to which programs and processes use the battery between charges (hence being responsible for the OS’ Battery Usage report screen).
Deleting this file will basically wipe your battery usage reports, which is done anyways automatically when the phone is fully charged (hence you’ll see a clear list when you reach a full charge). “Deleting it is not going to do anything to make your more device more fantastic and wonderful”.