Battery module

A vehicle, comprising:

• a power source, the power source providing a motive power for the vehicle;
• and
• a battery module configured to provide electricity to the power source, the battery module including:
• a first battery having a first terminal, the first terminal including a first metal;
• a second battery having a second terminal, the second terminal including a second metal different from the first metal;
• and
• a connecting member electrically connecting the first terminal to the second terminal, the connecting member having a first portion and a second portion, a face of the first portion being joined to a face of the second portion, a nugget zone being disposed where the face of the first portion meets the face of the second portion, the first portion including a third metal, the second portion including a fourth metal, and the fourth metal being different from the third metal.