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NESSCAP Energy Inc which stands for New Energy Storage Systems + Capacitor is a Korean company and was established as a research and development facility in 1998 with mass production of the company products following in 2001. The company is a global leader in technology innovation and product development of Ultracapacitors.

The company specialises in the production of Ultracapacitors, also known as supercapacitors, supercondensers, electric double layer capacitors (EDLC) or pseudocapacitors which is an electric capacitor that has an unusually high energy density when compared to common capacitors, typically on the order of thousands of times greater than a high capacity electrolytic capacitor.

The technology is used in applications where power, life cycle requirements or environmental conditions limit the suitability of other energy storage devices such as batteries or other capacitors. Uniquely structured, NESSCAP products are used to enhance the performance of energy and power needs for modern applications throughout all existing markets, ranging from portable electronic devices to high-tech hybrid cars. The products are available in single cells and module blocks.

NESSCAP features a wide array of standard commercial products in the market from 3 farads to 6,200 farads with high performance electrolytes as well as industry recognized alternative organic electrolytes.

The company has approvals ISO9001:2000, ISO/TS16949/200 and ISO14001/2004 as well as specific approvals for major customers. More recently 2017 saw Nesscap acquired by Maxwell Technologies, Inc. (NASDAQ: MXWL)