Ultracapacitors have very high specific power which is largely unaffected by temperature through their operational range. When ultracapacitors are paired with high energy sources, the combined system peak power can increase dramatically.

Ultracapacitors have a design life of 10 years at rated voltage and 25 °C. Reducing voltage and temperature can increase design life, while increasing temperature and voltage will shorten design life. Most applications will use cells at a lower nominal voltage to get longer design life at higher temperatures.

An ultracapacitor only provides energy as its voltage decreases and absorbs energy as its voltage increases. The output voltage is dependent on the state of charge. An upper and lower voltage limit has to be used to determine working voltage range.

IOXUS Ultracapacitors can be charged from 0.0 VDC up to 2.7 VDC.

Ultracapacitors store much more energy than other traditional capacitors, but substantially less than batteries. To determine the energy stored in an ideal capacitor take the upper voltage and square that, then subtract the square of the lower voltage and multiply the result by one half the cell capacitance to get the energy transferred in joules. E = 1/2C x (Vupper2 – Vlower2)