I just tested the GT Micro with the known best 14500 cells on the market. The new Shockli 14500 1000 mah matches the output of the previous king of high current 14500, Windyfire 600mah but with much more capacity. Very impressive. The output with these cells make this light almost as bright as the GT Mini and D1S. The Shockli also beats Sanyo UR14500P by a large margin, which was the previous best overall 14500.