I have a battery plugged into my board into the "optional" battery slot. And I dont know how it is supposed to work.
I also have a 3.5v supply that is plugged into the pin labeled 3V, located right next to the reset button.
Anyway, I was under the impression that if the power that is connected by the reset button, were gone, the optional battery would take over and begin supplying power to the board.
But it doesn't work that way. When I remove the power into the reset-pin-button, the board dies.
Hence my question. Do I need to do more, other than just have the optional battery plugged in ?