By John Gartner at Matter Network
Wed Mar 30, 2011 4:25pm EDT

Ultracapacitors continue to be barely a whisper in the energy storage conversation, but recent rumblings of support from investors, government and industry suggest something is afoot. Ultracapacitors, also known as super capacitors, are solid state devices that are superior to batteries in durability, power density and resilience to temperature changes, but they fall short in two key areas: high cost and low energy density.

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