NOVELTY - The battery pack (104) comprises a first battery that includes a first terminal having a first reference potential and a second terminal having a second reference potential, a second battery that includes a third terminal having a third reference potential and a fourth terminal having a fourth reference potential, and a bus bar, which comprises: a first terminal contactor portion that is an electrically conductive portion and directly contacts one of the first terminal and the second terminal of the first battery; and a second terminal contactor portion.    USE - The battery pack is useful in transportable applications including hybrid electric vehicles, plug-in hybrid electric vehicles, electric vehicles, heavy duty vehicles and vehicles with 42 V electrical systems, in stationary applications including backup power for telecommunications systems and uninterruptible power supplies and in distributed power generation applications, where the battery includes nickel metal hydride battery, lead-acid battery, lithium battery and lithium-ion battery.    ADVANTAGE - The battery pack enhances the performance of the vehicles.    DETAILED DESCRIPTION - The battery pack (104) comprises a first battery that includes a first terminal having a first reference potential and a second terminal having a second reference potential, a second battery that includes a third terminal having a third reference potential and a fourth terminal having a fourth reference potential, and a bus bar, which comprises: a first terminal contactor portion that is an electrically conductive portion and directly contacts one of the first terminal and the second terminal of the first battery; a second terminal contactor portion that is an electrically conductive portion and directly contacts one of the third terminal and the fourth terminal of the second battery; and a connecting portion that is an electrically conductive portion, is electrically connected between the first terminal contactor portion and the second terminal contactor portion and creates an open circuit between the first and second terminal contactor portions in response to current flow through the connecting portion that is greater than a predetermined current for a predetermined period. A cross-sectional area of the connecting portion corresponds to the predetermined current and the predetermined period. The connection portion: is made from an electrically conductive material that is selected based on the predetermined current and the predetermined period; and consists of one electrical conductor that is electrically connected between the first terminal contactor portion and the second terminal contactor portion. The connecting portion is made of a solder. The first and second terminal contactors are made from an electrically conductive material. An INDEPENDENT CLAIM is included for a method of manufacturing a battery pack.    DESCRIPTION OF DRAWING(S) - The diagram shows a block diagram of an electric vehicle system including a battery pack.    Battery pack (104)    Electric vehicle control module (108)    Batteries (112)    Battery control module (116)    Heater. (124)