content: My jaw dropped when I read the specs. Doing the energy calculation, it can hold just under 13000 Joules of charge, which is comparable to a battery of similar  size lithium AA battery (assuming 2900mA-Hour @1.5v)... [edited to include accurate comparisons] It is still mindbogglingly impressive that we have this now. [edit 2] A good NiPo battery of comparable size and weight can hold ~190,000 Joules, which is a little over 15x what this capacitor can hold. Still, this is a fantastic stride forward in energy storage technology.