Distinction From Symmetrical Capacitors

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KAPower vs. Symmetrical EC's

KAPower vs. Symmetrical Ultracapacitors

KAPower Nickel Carbon Supercapacitor Symmetrical EC’s, Supercapacitor, Ultracapacitors.
Energy Density Moderate / High Low / Moderate
Power Density High Moderate / High
Cycle Life High High
Self-Discharge Rate Very Low Low
Electrolyte Aqueous Organic / Aqueous /Non-Aqueous
Low Temperature Performance Excellent Moderate
Packaging Type Non-Hermetic Hermetic / Non-Hermetic
Voltage Balance None Active / Resistor
Materials Nickel & Carbon Carbon or Metal Oxide
Voltage Per Cell 1.3V to >1.6V ~0.9V to ~2.5V
KAPower is a electrochemical capacitor (a.k.a. supercapacitor or ultracapacitor)

KAPower Nickel Carbon vs. Symmetric EC’s
(a.k.a. Electrochemical Capacitors, Supercapacitors, or Ultracapacitors)

KAPower Nickel Carbon

Symmetric EC’s


How well can it crank the engine and for how long?

  • Very low leakage current – maintains a charge for extended periods of time.
  • ESR (equivalent series resistance) is not closely dependent on temperature or state of charge. The ability to supply high power in a wide range of operating temperatures and states of charge (voltage) is great.
  • Very high energy and power density. Has a “Faradaic” process in one electrode that creates high energy density capabilities.
  • High leakage currents. Must be isolated from batteries during periods of none use.
  • ESR is dependent on temperature and state of charge. As temperature drops so does power.
  • Usually associated with fair to poor energy densities.
  • Ultimate performance and life expectancy is dependent on keeping individual cell voltages balanced with external (electronic) methods.


Are you going to hurt yourself or others?

  • Cells are not hermetically sealed. Will not create a catastrophic failure from over charging or exposure to extreme temperature.
  • Electrolyte is a weak solution of KOH. No extreme Hazardous Materials or related issues.
  • Shipping, storage, handling and re-cycling of materials is common practice.
  • Cells must be hermetically sealed. Potential for high-pressure rupture of vessel (cell).
  • Overcharge / Exposure to high temperature extremes can cause catastrophic failure.
  • Acetonitrile electrolyte has potential to cause cyanide poisoning.
  • Shipping, storage and handling requirements may be stringent and must be adhered to.
  • Can have extreme Hazardous Material issues


How reliable is it for engine starting or high pulse-power applications?

  • Long shelf or storage life while maintaining a usable state of charge.
  • Will not “drain” batteries if left in a parallel connection.
  • Voltage between cells (capacitor) remains balanced as a natural occurrence.
  • Modules will leak down to 0 volts quickly. Must be “re-charged” prior to use, causing un-due stress on the batteries in the circuit.
  • Failure of the components used for electronically balancing the voltage between cells (capacitor) is problematic.