An electrochemical device, a condenser with an organic or inorganic electrolyte, whose "plates" are a double electric layer at the interface between the electrode and the electrolyte. Its advantage: Large maximum charging and discharging currents. Low degradation even after hundreds of thousands of charge / discharge cycles. Studies were carried out to determine the maximum number of charge-discharge cycles. After 100,000 cycles, there was no deterioration in performance. High internal resistance in most ionistors (prevents rapid self-discharge, as well as overheating and destruction). Ionistor has a long service life (at 0.6 U. about 40,000 hours with a slight decrease in capacity). Low weight compared to electrolytic capacitors of similar capacity. Low toxicity of materials (except organic electrolytes). Non-polarity (although "+" and "-" are indicated on ionistors, this is done to indicate the polarity of the residual voltage after it is charged at the factory).