Choose The Search Expert. The Fury DFT is the natural evolution of the best-selling Fury Tactical flashlight. DFT stands for Dual Fuel Tactical, which means the Fury can be powered by either our micro USB rechargeable SF18650B battery or two 123A lithium batteries. The SF18650B turns the single-output Fury DFT into a pocket-sized spotlight that's capable of projecting 1,500 lumens with a useful and far-reaching beam that's also optimized for situational awareness. Its built to withstand the harshest environments.