A battery pack (200, 400), comprising: a cell holder; a plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) positioned at a first end of the cell holder; and a plurality of battery cells (102, 104, 106, 108, 110, 112) arranged in the cell holder with each of the plurality of battery cells (102, 104, 106, 108, 110, 112) having a first terminal proximate to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) and a portion of a second terminal proximate to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606), the first terminal and the portion of the second terminal electrically coupled to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) at a first end of the battery cell such that the plurality of battery cells (102, 104, 106, 108, 110, 112) is in one of a parallel connection, a series connection, or a parallel and series connection; wherein the plurality of bus bars (214, 216, 218, 222 404, 406, 602, 604, 606) includes: a first bus bar (218, 404) coupled to a first one of the first terminals; a second bus bar (222, 406) coplanar with the first bus bar, the second bus bar coupled to a first one of the second terminals and a second one of the first terminals; and a third bus bar (216, 602) coupled to a second one of the second terminals, the third bus bar disposed over an insulator layer (232, 502); characterized in that the insulator layer (232, 502) is disposed over the first bus bar (218, 404) and the second bus bar (222, 406), wherein the third bus bar (216, 602) is coupled to the second one of the second terminals by a wire extending through aligned apertures of the first bus bar (218, 404), the insulator layer (232, 502) and the third bus bar (216, 602). a cell holder; a plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) positioned at a first end of the cell holder; and a plurality of battery cells (102, 104, 106, 108, 110, 112) arranged in the cell holder with each of the plurality of battery cells (102, 104, 106, 108, 110, 112) having a first terminal proximate to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) and a portion of a second terminal proximate to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606), the first terminal and the portion of the second terminal electrically coupled to the plurality of bus bars (214, 216, 218, 222, 404, 406, 602, 604, 606) at a first end of the battery cell such that the plurality of battery cells (102, 104, 106, 108, 110, 112) is in one of a parallel connection, a series connection, or a parallel and series connection; wherein the plurality of bus bars (214, 216, 218, 222 404, 406, 602, 604, 606) includes: a first bus bar (218, 404) coupled to a first one of the first terminals; a second bus bar (222, 406) coplanar with the first bus bar, the second bus bar coupled to a first one of the second terminals and a second one of the first terminals; and a third bus bar (216, 602) coupled to a second one of the second terminals, the third bus bar disposed over an insulator layer (232, 502); characterized in that the insulator layer (232, 502) is disposed over the first bus bar (218, 404) and the second bus bar (222, 406), wherein the third bus bar (216, 602) is coupled to the second one of the second terminals by a wire extending through aligned apertures of the first bus bar (218, 404), the insulator layer (232, 502) and the third bus bar (216, 602). a first bus bar (218, 404) coupled to a first one of the first terminals; a second bus bar (222, 406) coplanar with the first bus bar, the second bus bar coupled to a first one of the second terminals and a second one of the first terminals; and a third bus bar (216, 602) coupled to a second one of the second terminals, the third bus bar disposed over an insulator layer (232, 502); characterized in that the insulator layer (232, 502) is disposed over the first bus bar (218, 404) and the second bus bar (222, 406), wherein the third bus bar (216, 602) is coupled to the second one of the second terminals by a wire extending through aligned apertures of the first bus bar (218, 404), the insulator layer (232, 502) and the third bus bar (216, 602).