NOVELTY - Fabricating relatively thin film battery cell involves forming electrodes, contacting metal layer (104) to first surface (106) of a non-metallic and non-electrically conductive support structure, where support structure includes second surface (110) opposite first surface and a cavity defined by cavity wall (108) that extends between openings, metalizing a portion of cavity to provide metal tube (112) within cavity and in contact with metal layer, depositing an electrochemically active material within metal tube, and depositing electrolyte within non-metalized portion of cavity.    USE - For fabricating a relatively thin film battery cell (claimed).    ADVANTAGE - The non-metallic and non-carbon porous support structures disclosed reduces overall mass and volume of an electrode and/or battery cell, and reduces manufacturing costs. Many polymers are inherently low-density materials, and making them porous further reduces their mass. Electrodes and battery cells can be fabricated under ambient conditions, and can be cut, shaped, flexed, and/or stacked, which permits incorporation within a device to be powered. The absence of a physical separator between electrodes reduces internal resistances and mass, and provides additional flexibility to a battery. The electrodes and battery cells provide relatively high energy density and high power discharge capabilities. The electrode can be designed to be substantially transparent to electromagnetic radiation for a specified range of wavelength.    DETAILED DESCRIPTION - Fabricating a relatively thin film battery cell involves forming first and second electrodes including, contacting a metal layer (104) to first surface (106) of a non-metallic and non-electrically conductive support structure, where support structure includes a second surface (110) opposite the first surface and a cavity defined by a cavity wall (108) that extends between openings through the first and second surfaces, where a thickness of the support structure and a corresponding height of the cavity wall is within a range of approximately 1-20 micrometers, metalizing a portion of the cavity to provide a metal tube (112) within the cavity and in contact with the metal layer, where metal tube includes metal wall in contact with the cavity wall and having a height (116) less than the cavity wall height, depositing an electrochemically active material within the metal tube, and depositing an electrolyte within a non-metalized portion of the cavity; and coupling the first and second electrodes together with the corresponding support structure second surfaces facing one another and with the corresponding second surface cavity openings at least partially aligned with one another.    DESCRIPTION OF DRAWING(S) - The figure shows perspective cross-sectional view of an electrode, including a partially metallized cavity within a non-metallic support structure to hold an energy storing material and an electrolyte.    Electrode (100)    Structure (102)    Metal layer (104)    First surface of structure (106)    Cavity wall (108)    Second surface of structure (110)    Metal tube (112)    Metal wall (114)    Height (116)    Active material (122)    Non-metalized cavity portion (130)