Better Battery 2 is showing a different charge level than my Mac! Why?
Better Battery 2 calculates the REAL charge level based on the current capacity values of the battery - i.e. the maximum capacity and the current capacity of the battery. Apple does not show the real value, but only shows an "embellished" or "optimized" value. So, the values are different.
The REAL charge level is calculated with following formula: 100 / Max. Capacity * Current Capacity