Do the Nano 5V and Mini Pro 5V have different rated and maximum current specs?

AFAIK absolute max for that MCU is 6volt.
There is a 1N4001 diode in series with the battery.
That diode drops about 0.7volt.

Not sure why the regulator (~100uA idle current) was removed.
A servo uses AFAIK way more idle current than that.
Leo..