Definition of "ultracapacitor" [ultracapacitor]

• A supercapacitor. (noun)

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• "Based in Cedar Park, Texas, EEStor has been tight-lipped about their technology--long thought to be a special kind of ultracapacitor, which is essentially the CFL of the energy storage world."
• "The battery marries a device called an ultracapacitor, which bottles up something like a lightning bolt of power, with a conventional battery, which can store more energy but absorbs and discharges it at a slower rate."
• "The issue is that EEStor's technology - which, unlike the lead-acid batteries in ZENN's current cars, is based on a so-called ultracapacitor made with barium titanate - remains cloaked in secrecy."