Why can't the Arduino withstand 14.8 volts?

Question

Arduino

There are four 3.7 volt batteries, which ultimately give 14.8 volts. When I connect the wires from the batteries to GND and VIN On the controller, it starts to get very hot. Arduino Nano controller
And it seems that something burned out ...
Recently I worked with such a voltage, I connected 4 5v motors. through the driver, power from the batteries to the driver and to the board through vin. But then something went wrong and he became a vegetable

Answer 1

there is a parametric stabilizer that turns all the "extra volts" into heat. In your case it is 9.8V. Atmega328 consumes 5mA + current of any LEDs 20-30mA, as a result 9.8 * 30 = 300mW, this is almost the limit for the installed stabilizer. And if you add a load on the inputs / outputs, smoke can go. Therefore, for Arduino, the limit is 12V, and no more than 9V is recommended.

Answer 2

strange numbers ..
maybe you mean not the real voltage, but the numbers written on the battery case?
for example, these are lithium batteries and then 3.7 is the voltage of a dead battery, and when charged, there are 4.2 volts
for four in total as much as 16.8 volts, it's good that the smoke did not go.