Two miniature electrochemical capacitors, of high power and sufficient energy capacity, are prepared using photolithography and transferred to a plastic substrate. The preparation procedure involves, inverting a 60μm thick interdigital pattern of multi-walled carbon nanotubes (CNT) with a Scotch tape, such that the pre-sputtered gold layer at the bottom effectively collects interfacial charge. The equivalent series resistance (ESR) of the symmetric CNT capacitor measures 0.40Ωcm2, while that of the asymmetric capacitor with a positive α-Co(OH)2/CNT electrode measures 0.45Ωcm2, much less than the as-grown CNT capacitor. Electrodeposited α-Co(OH)2 enhances the cell capacitance significantly, especially in a wide potential window. When operated at current density 20Ag−1 and window 1.8V, the cell capacitance of asymmetric capacitor measures 62.6Fg−1, much higher than that of symmetric capacitor 8.7Fg−1. But the symmetric CNT capacitor displays a better power performance because of a lower ESR. At current density 30Ag−1, its power density reaches 20.6kWkg−1 with energy density 2.2Whkg−1. In contrast, the asymmetric capacitor stores more energy, at 30Ag−1, it exhibits power density 11.4kWkg−1 and energy density 7.8Whkg−1.