NOVELTY - Battery module (900) comprises rechargeable batteries (100, 200, 300, 400, 500, 600), each comprising a first terminal (140, 240, 330, 430, 530, 630) and a second terminal (130, 230, 340, 440, 540, 640); and connection members (160, 260, 360, 460, 560) electrically connecting the rechargeable batteries (100, 200, 300, 400, 500, 600).    USE - The battery module is useful for portable compact electronic apparatuses such as mobile phones or notebook computers and camcorders. It can also be used as a power supply for driving a motor of a hybrid vehicle.    ADVANTAGE - The invention provides battery module having an improved structure in which rechargeable batteries are electrically connected to each other.    DETAILED DESCRIPTION - Battery module (900) comprises rechargeable batteries (100, 200, 300, 400, 500, 600), each comprising a first terminal (140, 240, 330, 430, 530, 630) and a second terminal (130, 230, 340, 440, 540, 640), the first terminal (140, 240, 330, 430, 530, 630) includes at least one differentiation portion comprising at least one of an indentation or a protruding portion, to differentiate the first terminal (140, 240, 330, 430, 530, 630) from the second terminal (130, 230, 340, 440, 540, 640); and connection members (160, 260, 360, 460, 560) electrically connecting the rechargeable batteries (100, 200, 300, 400, 500, 600), each of the connection members (160, 260, 360, 460, 560) is fixed to the first terminal (140, 240, 330, 430, 530, 630) of a first one of the rechargeable batteries (100, 200, 300, 400, 500, 600) and the second terminal of a second one of the rechargeable batteries (100, 200, 300, 400, 500, 600) adjacent to the first one, and comprises verification portions which fit the differentiation portions; or battery module (900) comprises rechargeable batteries (700) , each rechargeable battery (700) comprising, a case (750) containing an electricity generating electrode assembly; a cap plate (720) coupled to an opening of the case (750); first and second terminals (730, 740) protruding outward from the cap plate (720); a first terminal insulating member (733) between the first terminal (730) and the cap plate (720) having a differentation portion comprising at least one of an indentation or a protruding portion; and a second terminal insulating member (743) between the second terminal (740) and the cap plate (720); and connection members (760) fixed to a first terminal (730) of a first one of the rechargeable batteries (700) and a second terminal (740) of a second one of the rechargeable batteries (700) adjacent to the first one comprising a verification portion (765) which fits the differentiation portion.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of battery module.    Rechargeable batteries (100)    Second terminal (130)    Second indentation (131)    First terminal (140)    First indentation (141)    Protruding portion (145)    Connection members (160, 180)    Battery module (900)