AN ELECTRICAL POWER SUPPLY FOR A PHOTOGRAPHIC CAMERA AND ITS ACCESSORIES. CURRENT DEMANDS OF THE PHOTOGRAPHIC SYSTEM ARE MET BY A SECONDARY CELL MOUNTED WITHIN THE BASIC CAMERA STRUCTURE. THE SECONDARY CELL IS RECHARGEABLE DURING A PICTURE TAKING SEQUENCE BY A PRIMARY BATTERY INCORPORATED WITH A DISPOSABLE FILM CASSETTE. FOLLOWING THE EXHAUSTION OF FILM WITHIN THE CASSETTE, BOTH THE EMPTY CASSETTE AND THE PRIMARY RECHARGING BATTERY ARE DISPOSED OF. A DIODE OR THE LIKE IS INSERTED WITHIN THE INTERCONNECTING CIRCUITRY OF THE BATTERIES IN ORDER TO PREVENT A BACKDRAIN OF CHARGE FROM THE SECONDARY BATTERY.