Update mAh - What is it for?
The "Update mAh" button is generating much question as to what it actually does, and so far everyone is using it (rightfully) to get an update mAh measure!
Though it's purpose is not for that at all! It is used to update the actual battery capacity used by the application everywhere else! So since v2.0.2, the app asks a confirmation of the action mentioning that it has an effect on estimated times and possibly mA measures on many phones!
So, when opening the calibration screen, the app calculates a 'measured mAh' based on mA historical data. Then one can use the "Update mAh" to use that value from now on as the reference mAh capacity of the battery!
On many phones using "estimated mA" (check main screen for "Estimated: xx mA"), the mA is calculated based on % and mAh!!! So it is critical to have a realistic mAh set for the battery, otherwise the mA readings will be wrong as well as the measured mAh!