button - type battery electrode connection members , button - type battery constructions , and methods of establishing electrical connections with and between button - type batteries are described . in one implementation , an electrode connection member comprises an inner conductive surface , and outer peripheral conductive surface , and an intermediate conductive surface joined with and extending between the inner and outer surfaces . the connection member defines an internal volume which is sized to receive at least one thin - profile battery . in one aspect , the intermediate conductive surface tapers between the inner and outer surfaces . the taper enables more than one button - type battery to be mounted within the internal volume without the need for edge insulation material over one of the batteries to prevent grounding . the electrode connection member can be mounted on a substrate for providing a generally self - contained , space - conserving power source which can include more than one battery connected in a series electrical connection .