This 21700 single-slot detachable magazine power bank adopts a classic detachable magazine structure, perfectly compatible with all DJI Action series sports cameras and universally applicable to mobile phones and other digital devices for multi-purpose use. It supports free disassembly and replacement of 21700 lithium batteries with infinitely expandable battery life. It solves the power shortage problem during outdoor shooting and long-distance travel, enabling continuous power supply for cameras without built-in batteries and avoiding overheating and power-off stuttering during long-time recording. Built with an intelligent voltage stabilization and protection system, it effectively prevents overcharging, overdischarging, short circuits and overloads. The stable output protects your DJI cameras and mobile phones from damage. Compact and lightweight, it is highly portable and suitable for outdoor shooting, live streaming, daily commuting and home emergency use, serving as a cost-effective portable energy storage accessory for photographers and daily travel.