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Ultracapacitors and the Difference between Power and Energy

Batteries have low power density but high energy density, meaning they have a lot of energy that gets discharged slowly. Traditional capacitors, have high power density but low energy density, meaning they have less energy but can be discharged more quickly. Ultracapacitors fall somewhere in the middle, with high power density and medium energy density.

What is an Ultracapacitor?

Ultracapacitors, also known as electrochemical double-layer capacitors (EDLCs), are electrochemical capacitors that possess an unusually high power and energy density when compared with traditional capacitors—typically several orders of magnitude greater than a high-capacity electrolytic capacitor.