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How about the future outlook of the ultracapacitor relative to the battery?

Battery technologies such as Li-ion, NiMH or Lead-Acid are “mature” technologies for which chemical limits to performance are well known and already reached.  Hence, performance increases are incremental, if any, and chiefly come from packaging and process enhancements.

 Ultracapacitor is still an “infant-stage” technology with unexploited potential and because, it relies largely on physical properties to store energy, the technology is not constrained to absolute structural limits as with chemical batteries.  Also, in contrastto major batteries, the ultracapacitor of today has barely scratched the surface of energy storage potential and has barely graduated from “cottage-industry”style manufacturing and “sample quantity”purchase of raw materials.

Nesscap projects energy density of the ultracapacitor in 2009 to double from the current level.  The Editor of Battery & Energy Storage (Autumn 2003) comments: “Now this will be very serious threat to all battery technologies.” Chart 5 shows why : Nesscap’s newly announced Pseudocapacitor per kwh price approaches close to that of Li-ion battery as result of energy density improvements and volume production.  At similar price, but much better power, life and reliability, then indeed it’s a serious threat!