A battery pack comprising: a frame member that includes a floor, that includes walls (204, 208, 212) formed perpendicular to the floor, and that includes a single aperture defined by the walls (204, 208, 212), wherein the frame member is formed from an electrically non-conductive plastic; a first lithium ion prismatic cell that includes a first positive terminal and a first negative terminal, that includes a first electrically conductive housing with a first bottom surface, wherein the first positive terminal is electrically connected to the first electrically conductive housing; a second lithium ion prismatic cell that includes a second positive terminal and a second negative terminal, that includes a second electrically conductive housing with a second bottom surface, wherein the second positive terminal is electrically connected to the second electrically conductive housing; and an isolation plate that directly contacts both the first and second electrically conductive housings and electrically isolates the first electrically conductive housing from the second electrically conductive housing, wherein the isolation plate is formed from the electrically non-conductive plastic, characterized in that the first lithium ion prismatic cell is disposed between the walls (204, 208, 212) of the frame member and extends from the first bottom surface in contact with the floor towards the aperture, the second lithium ion prismatic cell is disposed between the walls (204, 208, 212) of the frame member and extends from the second bottom surface in contact with the floor towards the aperture, and the isolation plate is moveably disposed between the walls (204, 208, 212) of the frame member and the first lithium ion prismatic cell and the second lithium ion prismatic cell such that the isolation plate directly contacts both the first and second electrically conductive housings. a frame member that includes a floor, that includes walls (204, 208, 212) formed perpendicular to the floor, and that includes a single aperture defined by the walls (204, 208, 212), wherein the frame member is formed from an electrically non-conductive plastic; a first lithium ion prismatic cell that includes a first positive terminal and a first negative terminal, that includes a first electrically conductive housing with a first bottom surface, wherein the first positive terminal is electrically connected to the first electrically conductive housing; a second lithium ion prismatic cell that includes a second positive terminal and a second negative terminal, that includes a second electrically conductive housing with a second bottom surface, wherein the second positive terminal is electrically connected to the second electrically conductive housing; and an isolation plate that directly contacts both the first and second electrically conductive housings and electrically isolates the first electrically conductive housing from the second electrically conductive housing, wherein the isolation plate is formed from the electrically non-conductive plastic, characterized in that the first lithium ion prismatic cell is disposed between the walls (204, 208, 212) of the frame member and extends from the first bottom surface in contact with the floor towards the aperture, the second lithium ion prismatic cell is disposed between the walls (204, 208, 212) of the frame member and extends from the second bottom surface in contact with the floor towards the aperture, and the isolation plate is moveably disposed between the walls (204, 208, 212) of the frame member and the first lithium ion prismatic cell and the second lithium ion prismatic cell such that the isolation plate directly contacts both the first and second electrically conductive housings.