How to get battery level with 1

Question

How to get battery level with 1 % accuracy .

       [UIDevice currentDevice].batteryLevel

Will give battery level with accuracy of 5%. But

Answer 1

If you turn off Setting->General->Usage->Battery Percentage, Battery Doctor shows your battery level with %5 precision...So I guess that they are running some image recognition algorithm for the upper right corner of the device, where the battery percent is shown.