Those are some good points and quite honestly we do not have all of the facts of different products to give you a good answer other than to say that capacitors in general are just as efficient at storing energy as a battery. I am not saying that we will not have a battery or fuel cell or some other technology available, but we believe that these ultracapacitors are Key to our energy recapturing techniques.
I believe the data sheets expressed the leak as a ratio of charge... but it really is minor.
Yes the discharge and charging characteristics are very different from batteries... however it is not hard to regulate the power draw from these devices. our biggest concern is losses from wires and other components from resistance.
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