Q Is Ultracapacitor dangerous regarding ACN(Acetonitrile)?

ACN(Acetonitrile) is one of material used as electrolyte of Ultracapacitor. Electrolytes are absorb in electrode and sealed in housing of cell for safety.

However, ACN(Acetonitrile) has concerns about the harmfulness from the flammable property or side-reaction gas from a misuse.

Q Is long product life (1 million cycle life or 10 years calendar life) really possible?
Long term product life forecast is based on accelerated life test conditions. Produce life is accelerated in higher temperature or operating voltages and accelerated test conditions are based on the accelerating relationship between mentioned factors. 1 million cycle life for cylindrical cells, 0.5 million cycle life for medium size cells and 10 years calendar life at 25 is based on our accelerated life test conditions.

Q What is self-discharge characteristic of the Ultracapacitor? And how long is the charged state maintained?

The product self-discharge rate may different by initial charge state and temperature (condition) of the product. Please "contact us" for further details

Q What is advantage of Ultracapacitor over batteries?
Below are advantage of Ultracapacitor over batteries



 Rechargeable Battery

 Discharge rate

 1 ~ 30 sec

 0.3 ~ 4 hrs

 Charge rate

 sec ~ min

 0.5 ~ 5 hrs

 Energy Density (Wh/kg)

 1 ~ 10

 30 ~ 100

 Power Density (W/kg)

 1,000 ~ 2,000

 50 ~ 200

 Charge/Discharge Efficiency

 0.9 ~ 0.95

 0.7 ~ 0.85

 Cycle life


 500 ~ 2,000

 Operating Temp.

 -40℃ ~ 65℃

 0℃ ~ 40℃

Q How does temperature and voltage effect on product life?

According to Arrhenius Equation commonly cited in Ultracapacitor, for every 10 drop of operational temperature, the product life becomes approximately double if all other conditions being equal. Likewise for every 0.1 V drop, the product life extends about double.