A capsule camera system , comprising: a housing having an elongated shape and adapted to be swallowed; a power source within the housing located at a first end of the housing, the power source comprising: at least one battery ; a first battery-contact pad contacting a first polarity terminal of said at least one battery ; a first circuit board comprising a second battery-contact pad contacting a second polarity terminal of said at least one battery ; and power-output nodes disposed on the first circuit board and facing away from the first end of the housing, which power-output nodes are on a plane perpendicular to a longitudinal axis of the housing; a capsule sub-system within the housing positioned further from the first end than the power source, the capsule sub-system comprising: a light source ; a camera for capturing a digital image of a scene illuminated by the light source; and a second circuit board , on which the light source is disposed; an electrical interconnect between the power source and the capsule sub-system connecting the second circuit board to the power-output nodes , wherein the electrical interconnect comprises electrical contacts at one or both ends, wherein electrical power is supplied to the capsule sub-system from the power source through the electrical interconnect , and wherein at least one of the electrical contacts, either between the electrical interconnect and the power-output nodes or between the electrical interconnect and the second circuit board , is a pressure contact. a housing having an elongated shape and adapted to be swallowed; a power source within the housing located at a first end of the housing, the power source comprising: at least one battery ; a first battery-contact pad contacting a first polarity terminal of said at least one battery ; a first circuit board comprising a second battery-contact pad contacting a second polarity terminal of said at least one battery ; and power-output nodes disposed on the first circuit board and facing away from the first end of the housing, which power-output nodes are on a plane perpendicular to a longitudinal axis of the housing; at least one battery ; a first battery-contact pad contacting a first polarity terminal of said at least one battery ; a first circuit board comprising a second battery-contact pad contacting a second polarity terminal of said at least one battery ; and power-output nodes disposed on the first circuit board and facing away from the first end of the housing, which power-output nodes are on a plane perpendicular to a longitudinal axis of the housing; a capsule sub-system within the housing positioned further from the first end than the power source, the capsule sub-system comprising: a light source ; a camera for capturing a digital image of a scene illuminated by the light source; and a second circuit board , on which the light source is disposed; a light source ; a camera for capturing a digital image of a scene illuminated by the light source; and a second circuit board , on which the light source is disposed; an electrical interconnect between the power source and the capsule sub-system connecting the second circuit board to the power-output nodes , wherein the electrical interconnect comprises electrical contacts at one or both ends, wherein electrical power is supplied to the capsule sub-system from the power source through the electrical interconnect , and wherein at least one of the electrical contacts, either between the electrical interconnect and the power-output nodes or between the electrical interconnect and the second circuit board , is a pressure contact. <EOS>