Cycle versus voltage hold - Which is the better stability test for electrochemical double layer capacitors?

► Stability tests for double layer capacitors by cycling and voltage hold were compared. ► The voltage hold test turns out to be more demanding than the cycle test. ► The same capacitance loss was observed after much shorter test time for the voltage hold test. ► The cycle test overestimated the voltage limit for stability by about 0.3 V.