a camera containing at least one first battery and at least one second battery therein includes first means supplied with an electric power by the at least one first battery , thereby becoming operable , second means supplied with an electric power by the at least one second battery , thereby controlling the operation of the first means , and third means operated to render the at least one second battery removable from the camera , the power supply from the at least one second battery to the second means being impeded by the third means being operated , the third means impeding the power supply from the at least one first battery to the first means prior to the impediment of the power supply from the at least one second battery to the second means , in response to the operation of the third means .