ESMA has developed and patented the most advanced technology of electrochemical capacitors (supercapacitors, ultracapacitors, electric double layer capacitors) available. Of asymmetric design, this third generation technology uses a negative electrode of activated carbon material (polarizable electrode) and a positive Faradaic (non-polarizable) electrode. The positive electrode is made of nickel oxyhydroxide. A low cost aqueous KOH solution, as in alkaline batteries, is used for the electrolyte.

The third generation design results in a supercapacitor with high specific capacitance and energy and low internal resistance, which is weakly dependent on the temperature.

ESMA capacitors have long service life, low self-discharge, do not require maintenance during operation and storage (or require infrequent maintenance - for "traction" capacitor versions), have wide operating temperature range, and operate reliably at extremely low temperatures (-50 ⁰C/-58 ⁰F).

One significant distinction of ESMA capacitors from all other supercapacitors is their ability to be over-voltaged without failure and destruction.

Unlike batteries and other capacitor technologies, ESMA asymmetric supercapacitors do not contain lead, arsenic, mercury, cadmium, or other toxic materials.

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