Steele.
Your link led me to this.

http://cleantechnica.com/2011/05/11/cheaper-ultracapacitors-for-electric-vehicles/

Note capacitor cost in addition to battery cost.

JF Aus,
I think the scrap value of batteries will be high enough to prevent dumping.

I'm glad to see the cost of capacitors is coming down so quickly.

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Cupric Embarrasment,
You seem to have overlooked nickel cadmium batteries, which were first commercialized in the 1960s