On certain vehicles, the DC-DC converter, which charges the alternative battery, does not have an appropriate electrical terminal, and therefore, oxide may accumulate around the caulking of the terminal and heat up leading to wire breakage, if the vehicle is driven with increased electrical load for a long time, for example when the ambient temperature is very low. If such wire breakage occurs, the alternative battery will not be charged, and in the worst case, the engine and/or the electrical motor would stop, and the vehicle would not restart.