NOVELTY - The bipolar device comprises a substrate, a first terminal, a second terminal, and a localized conductive region comprising an electroactive material formed on the substrate and surrounded by an insulating region. The first and/or second terminals are electronically connected to the conductive region. The localized conductive region has an area of less than 100 nm2. The bipolar device has a volume of less than 1 mm3, and is made by a method comprising generating a field causing particles of a first electroactive material in a medium to form an electronically continuous electrode.    USE - The bipolar device such as battery (claimed), capacitors, fuel cells, electrochromic displays and windows, and sensors is useful in cellular telephones, laptop computers, personal digital assistants and toys.    ADVANTAGE - The bipolar device can be simply and economically manufactured with enhanced energy density and power density, long cycle life, excellent storage capability and improved device performance.    DETAILED DESCRIPTION - The bipolar device comprises a substrate, a first terminal, a second terminal, and a localized conductive region comprising an electroactive material formed on the substrate and surrounded by an insulating region. The first and/or second terminals are electronically connected to the conductive region. The localized conductive region has an area of less than 100 nm2. The bipolar device has a volume of less than 1 mm3, and is made by a method comprising generating a field causing particles of a first electroactive material in a medium to form an electronically continuous electrode, creating an electronically insulating separation between the first electroactive material and a second electroactive material, preserving the electronically insulating separation between the first and second electroactive materials, depositing particles of the first electroactive material on the first terminal for forming an electronically continuous first electrode, and generating a second field causing particles of the second electroactive material to deposit on the second terminal for forming an electronically continuous second electrode. The second terminal is electronically connected to the second electroactive material. INDEPENDENT CLAIMS are included for:    (1) a method of making an electrode; and    (2) an electrode.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a process for making a battery by electrophoretic deposition.