NOVELTY - The thin film battery (20) comprises a substrate (24a, 24b) comprising a surface including a battery cell (22a, 22b) having a non-contact surface with a central portion and a peripheral portion, a thermoplastic material covering the surface of the battery cell, a cap (26a, 26b) covering the thermoplastic material, an external coating, a first polymer covering the non-contact surface of the battery cell, and a second polymer covering the peripheral portion of the non-contact surface. The battery cell is placed on a support. The battery cell comprises electrodes about an electrolyte.    USE - The thin film battery is useful for portable electronics, medical devices and space systems and to power electric cars or store electrical power in home or electrical grid.    ADVANTAGE - The thin film battery has higher energy density, specific energy, structural strength and performance, reduced size, improved lifespan, and excellent charge/discharge characteristic.    DETAILED DESCRIPTION - The thin film battery (20) comprises a substrate (24a, 24b) comprising a surface including a battery cell (22a, 22b) having a non-contact surface with a central portion and a peripheral portion, a thermoplastic material covering the surface of the battery cell, a cap (26a, 26b) covering the thermoplastic material, an external coating, a first polymer covering the non-contact surface of the battery cell, and a second polymer covering the peripheral portion of the non-contact surface. The battery cell is placed on a support. The battery cell comprises electrodes about an electrolyte. The thermoplastic material has a nitrogen permeability or oxygen permeability that is less than 20 cm3/mm/(m2/day), a water permeability of less than 0.1 g mil/(in2/day), a thickness of less than 50 microns, and an elastic modulus of less than 1 GPa. The cap comprises metal, ceramic or polymer. The battery cell comprises edges, where the external coating covers a portion of the edges. The total water permeability of the polymer layers is less than 0.1 g mil/(in2/day)4 g/mm/(m2/day). An INDEPENDENT CLAIM is included for a battery fabrication process.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic sectional view of a battery.    Battery (20)    Battery cells (22a, 22b)    Substrates (24a, 24b)    Protective packages (25)    Caps. (26a, 26b)