Fenix ARB-L21-5000 V2.0 is the latest Fenix 21700 Li-ion battery with 5000mAh battery capacity, featuring sufficient power and steady performance. ARB-L21-5000 V2.0 provides the lighting tools with longer duration. The multiple protection ensures the use safety and good performance of the battery; steel shell riveting technology protects the battery against damage; pressure relief vents rapidly expel internal gas.