Abstract: A battery module includes module first and second terminals of opposing polarity. The module houses an array of electrochemical cells and includes a first bus bar that electrically connects the cell first terminals of at least a subset of the cells to the module first terminal, and a second bus bar that electrically connects the cell second terminals of the subset of the cells to the module second terminal. A first electrical connector electrically connects the first bus bar to a cell first terminal of each cell of the subset of the cells. The first electrical connector has a first current carrying capacity. A second electrical connector electrically connects the second bus bar to a cell second terminal of each cell of the subset of the cells. The second electrical connector has a second current carrying capacity. The first current carrying capacity is different than the second current carrying capacity.