Leonardo - running temperature ?

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hello
i have received leonardo , connecting 16volt battery. positive centre pin , same config works fine on motor controller card have. when attach battery nothing attached leonardo, component around input plug become hot untouchable. replacing card prior card had accident , don't remember running hot . but  again never checked.
please tell me if normal?
thanks

operating voltage    5v
input voltage (recommended)    7-12v
input voltage (limits)    6-20v

https://www.arduino.cc/en/main/arduinoboardleonardo

the more voltage apply it, more heat has dispense.


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