It is said that the battery should be first charged before doing an update.

But what is the reason for that?

Is it:
1. To prevent the device from an unfinished firmware update in case of a to low battery

ir is it also
2. The OS saves the value for 100 % battery capacity somewhere and so, can't be fully loaded to 100 % again, when the update
was done at 90 % battery capacity, setting the 90 % battery capacity to maximum capacity. In other words 90 % gets the new 100 % value.


Is 2 possible or is battery management done without the support of the OS?