It is powerbank using supercapacitors can changes within minutes and then used to change the devices.
Brief Description: We charge 2x350 farad capacitors in series up to 5.4VDC, and feed that voltage through a DC-DC booster circuit. A digital voltage display that to read both the charge on the capacitor bank, as well as the voltage at the output of the DC-DC booster. This powerbank can charge within minute and stored 10 times more power than ordinary battery. It’s life cycle more than ordinary battery.