This 21700 dual-slot detachable power bank adopts an upgraded dual-slot detachable magazine structure, professionally designed for 21700 lithium batteries. It allows free disassembly and replacement of dual batteries and supports infinitely cyclic battery life, perfectly solving the problems of insufficient and interrupted power supply during outdoor activities and shooting. Equipped with a dual-output power supply design, it can charge two digital devices at the same time, greatly improving charging efficiency. Built with an intelligent multi-protection and voltage stabilization system, it effectively avoids safety risks such as overcharging, overdischarging, short circuits and overloads. The constant voltage and current output will not damage device batteries, ensuring all-round power safety. Compact and easy to carry, it is widely compatible with DJI Action series cameras, smartphones, Bluetooth earphones and various small digital devices. It is suitable for outdoor shooting, live streaming, daily commuting and home emergency use, serving as a versatile and cost-effective portable energy storage accessory.