The ARB-L18-1100 is Fenix's lithium ion rechargeable battery for flashlights such as the TK05R. It has an 1100 mAh capacity and features multiple layers of protection including overcharge and over discharge, short circuit, and overheat protection circuits in the anode plus a pressure relief valve, microporous protection, and PTC cathodal block protection. It has a 7A maximum current and is leak and explosion-proof made with steel shell riveting technology.
All Fenix rechargeable batteries are rated for up to 500 charge cycles and feature a 1 year warranty.