NOVELTY - Energy storage device is used by supplying power to appliance using energy storage device in which energy storage device contains set of solid state rechargeable battery cells, energy storage device comprises substrate component containing surface region and stack of electrochemical cells, and each electrochemical cell comprises positive electrode material comprising thickness of material, transition metal oxide or transition metal phosphate with thickness of 0.5-50 mu m, and solid state layer of ceramic, polymer, or glassy material with thickness of 0.1-5 mu m.    USE - Use of energy storage device for smartphone, cellular phone, radio or other portable communication device, laptop computer, tablet computer, portable video game system, MP3 player or other music player, camera, camcorder, RC car, unmanned airplane, airplane, vehicle, robot, underwater vehicle, satellite, GPS component, laser rangefinder, flashlight, electric street lighting, portable electronic devices (all claimed), solar panel, starter motor, auxiliary power system, satellite power source, microsensor device, and hybrid vehicle drive train.    ADVANTAGE - Energy storage device has improved energy density and eliminates occurrence of lithium dendrites, undesirable side reactions, or internal short circuits.    DETAILED DESCRIPTION - Energy storage device is used by supplying power to appliance using energy storage device in which energy storage device contains set of solid state rechargeable battery cells, energy storage device comprises substrate component containing surface region and stack of electrochemical cells, each electrochemical cell comprises positive electrode material comprising thickness of material, transition metal oxide or transition metal phosphate with thickness of 0.5-50 mu m, solid state layer of ceramic, polymer, or glassy material with thickness of 0.1-5 mu m for conducting lithium or magnesium ions during charge and discharge process, negative electrode material configured for electrochemical insertion or plating of ions during charge and discharge process with thickness of 0.5-50 mu m, and electrically conductive material, substrate component is made of polymer, metal, semiconductor, or insulator, positive electrode material comprises positive electrode layer, negative electrode material comprises negative electrode layer, and electrically conductive material comprises electrically conductive layer.