NOVELTY - The supply has a battery e.g. lithium ion battery, removably coupled to a mount. A power converter e.g. direct current to alternating current converter, is in electrical communication with the battery and a camera (101). The mount is affixed to a post (102) or a shaft, which supports the camera. A shroud (103) is provided for covering the batteries and the power converter to protect from undesirable atmospheric conditions. The batteries having different battery chemistries are removably coupled to the mount. The power converter is removably coupled to the mount.    USE - Power supply for supplying power from an external source such as line and mains power, an external battery such as automotive, aircraft and marine batteries or direct current electrical system, alternating current to direct current generator wind, energy source, solar panels and fuel cells, to a portable camera system (claimed) e.g. dual sensor type camera such as video camera, for monitoring and surviving crime scenes and combat zones and for communicating information to coordinating government official such as police and military forces, fire and rescue forces, doctor, nurse and staff in hospital during emergency by using a wireless network system. Can also be used in fixed camera, camera using large, high-resolution detectors with wide angle optics, high speed cameras for capturing high speed phenomena, still picture camera, camera sensitive to wavelengths such as infrared, visible, and UV light, and photographic and video capture device.    ADVANTAGE - The lightweight battery power supply is easily and quickly interchanged to provide continuous power to the security camera, thus enabling security forces such as police and military forces to safely and continuously monitor and survey areas including crime scenes and combat theaters. The power supply contains substantial power, and can be operated for extended periods of time.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a portable camera system.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a camera mounted on a post with replaceable batteries behind a shroud.    Front view (100)    Camera (101)    Post (102)    Shroud (103)