Ultracapacitor Cell comes in 3 V, 3,000 farad variant.

With 60 mm cylindrical form factor, K2 enables transportation industry to retrofit systems to increase power, reduce engine weight, and improve fuel efficiency. Grid markets will also benefit from options for more available power to smooth power intermittencies and reduce expenses. Able to perform over -40 to +65C range, ultracapacitor incorporates DuraBlue™ Advanced Shock and Vibration Technology. Electrostatic energy storage mechanism enables charge/discharge within fractions of 1…

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[source: http://news.thomasnet.com/fullstory/Ultracapacitor-Cell-comes-in-3-V-3-000-farad-variant-20054230]