Yes we know that, but have not received an explanation from the arduino designers on why that explicitly recommend not to power the board via the 5V pin. Do you know why they added the caution?Lefty
Probably because one time or another people forgets it's the 5V pin and applies more than 5V and destroy the board....
... or better use a switching regulator and power with a modified USB cable. The last option will make your solution run 2 times longer.
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