@gunrunnerjohn is that all the BCR2 is? a single cap and connector plug? I never thought about taking one apart to see. [I believe you - just stunned that's all there is.] For what its worth, I am working with a professor who has developed a supercapacitor based on graphene. He prints them with an "ink-jet" to any size and shape needed - all solid state. When he demo-ed it to me. They touched the leads to a battery to charge, them on to an LED which stayed lit. Nearly as thin as a sheet of paper. Really interesting.
CT McCormick Hardware has the BCR2 for $19.95 plus shipping. A bunch of sponsors are close to the same price within a couple of bucks. Like everything - order more than one item and the shipping per unit falls. I thought about going direct to JandW with their great holiday sale, but i will never use that many.
