a combined electrical filter and interrupted energy source for a space satellite or other dc powered apparatus . the disclosed filter battery preferably employs an array of nickel - cadmium cells each having circular configured electrodes parallelly disposed along an axis and interconnected by axially aligned inter - call conductors which attach to central areas of the electrodes . the resulting filter battery is electrically comprised of an array of selected value electrical elements disposed in a parallel - series configured network and related to elements of the battery cell structures . filtering accomplished with the filter battery achieves high electrical energy per pound storage density , low electrical impedance , long charge / discharge cycle life , large current delivering ability and more constant voltage output in comparison with conventional electrolytic capacitor filter elements and other cell configurations .