Abstract: An apparatus including an electrical source and a circuit board. The electrical source includes an outer shell including a receptacle, a battery arranged within the outer shell, and at least one electrical connector electrically connected to the battery and extending through the outer shell. The circuit board includes at least one circuit element and a mounting post. When the mounting post of the circuit board is received within the receptacle of the outer shell, the at least one electrical connector of the electrical source is electrically coupled to the at least one circuit element of the circuit board.