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Supercapacitors Leakage Current (LC)

The leakage current (LC) of supercapacitors is the minuscule current that flows when the rated voltage continues to be applied to the capacitor. It is measured in amperes (A).

As shown in Fig. 1, the leakage current diminishes over time, until it eventually stabilizes. This is because each individual particle of activated carbon in the electrodes acts as a capacitor with its own internal resistance. And these uncharged capacitors continue to charge gradually. Since the leakage current in a capacitor can also change depending on storage conditions, it is difficult to measure the true leakage current. A rough estimate is determined by measuring several dozen hours after a voltage has been applied.
 
[Fig. 1] Change in leakage current for a specific voltage over time
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