The application scheme of supercapacitors in smart water meters involves replacing lithium batteries with supercapacitors, which are encapsulated within the water meter, while an external dry battery provides power. Normally, the dry battery supplies the energy required for the water meter circuit and charges the supercapacitor. When it is necessary to open the water valve, it first checks whether the supercapacitor has stored enough energy; if not, it does not...